CLARE CPC2400 Embedded modem module Datasheet

CPC2400E
Embedded Modem Module
Description
The CPC2400E is a 2400 baud embedded modem module intended for applications that require a data communications link to the Public Switched Telephone Network
(PSTN). The CPC2400E is a complete module on a small
1.0” x 2.5” printed circuit board that can be socketed or
soldered into the host system mother board. The module
is FCC Part 68 approved and includes a user transferrable registration number. It also is a UL recognized
component. The CPC2400E can be used in a variety of
applications including set top box back channel communications, vending machines, remote utility metering,
remote data acquisition, plus a host of other applications.
The CPC2400E supports a standard serial V.24 TTL
interface to the DTE equipment.
Features
• Easy Integration
• Small Footprint 1.00” x 2.50”
• Full Duplex 2400bps
• Low Power Consumption
• V.24 DTE Interface
• Single +5V Supply Operation
• Supported Protocols: V.22bis, V.23, V.22
• UL Recognized Component
• FCC Part 15B Compliant
• FCC Part 68 Approved (User Transferrable)
Applications
• Vending/Gaming Machines
• Set Top Box Back Channel
• Direct Broadcast Satellite
• Utility Meters
• Point of Sale Terminals
• Remote Diagnostics
• Remote Telemetry
• Remote Monitoring
• Embedded Applications
Approvals
• UL/C-UL: 174201
• FCC Reg. # LVRPHL-25931-MD-E
Ordering Information
Part #
CPC2400E
Block Diagram
Description
2400 Baud Embedded Modem Module
Pin Configuration
+5V
LINE
INTERFACE
PARALLEL
DTE
CONTROLLER
V.24
SERIAL
V.22BIS
DATA PUMP
TIP
DAA
RING
VCC
GND
-DTR
-DCD
-MUTE
A1
N/C
RXD
TXD
J1
J2
N/C
TIP
N/C
RING
N/C
AUDIO
OUT
GND
DS-CPC2400-R2
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1
CPC2400E
Absolute Maximum Ratings (@ 25˚ C)
Parameter
Min
Max Units
-
1000 VRMS
Dielectric withstanding
Voltage
Tip/Ring Current
Continuous
Operating Temperature
Storage Temperature
Relative Humidity
(Non-Condensing)
Soldering Temperature
20
120
mA
0
0
10
70
100
85
oC
-
260
oC
Absolute Maximum Ratings are stress ratings. Stresses
in excess of these ratings can cause permanent damage
to the device. Functional operation of the device at these
or any other conditions beyond those indicated in the
operational sections of this data sheet is not implied.
Exposure of the device to the absolute maximum ratings
for an extended period may degrade the device and effect
its reliability.
oC
%
Electrical Characteristics
Parameter
Conditions
Min
Typ
Max
UnitS
Vcc=5V
Vcc=5V
Vcc=5V
Vcc=5V, f=20Hz
Vcc=5V
Vcc=5V
4.75
20
5.0
5
70
600
22
0.6B
-
5.25
10
100
30
120
V
mA
mA
Ω
VRMS
mA
GND<Vo<Vcc
IOH=-2.0mA; Vcc=5V
IOI=+2.0mA; Vcc=5V
Vcc=5.5V
Vcc=5.5V
2
0
-10
4.0
0
0.7
GND-0.3
2.6
1.6
Vcc+0.3
0.8
10
0.4
Vcc+0.3
0.2Vcc
V
V
µA
V
V
V
V
DC Electrical Characteristics @ 25˚C
Vcc Supply Voltage
Vcc Supply Current - Idle (Sleep Mode)
Vcc Supply Current - Active
Line Matching Impedance
Ringing Voltage
Ringer Equivalence Number (REN)
Telephone Line Loop Current
DTE DC Characteristics @ 25˚C
Input High Voltage VIH
Input Low Voltage VIL
Input Leakage Current IL
Output High Voltage VOH
Output Low Voltage VOL
Input High Voltage VIH
Input Low Voltage VIL
2
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Rev. 2
CPC2400E
Definitions
Pin
I/O
Name
Function
J1-1
J1-2
J1-3
I
I
I
VCC
GND
-DTR
J1-4
O
-DCD
J1-5
J1-6
O
O
-MUTE
A1
J1-7
J1-8
J1-9
I
O
N/C
RXD
TXD
Connects to external host power source of +5V +/-5%
Power supply return
Data Terminal Ready. An active Low input on this pin indicates
that the host system is ready to communicate with the modem.
Data Carrier Detect. When active, indicates carrier signal has
been detected. For options see AT Command reference section
under &C command.
Mutes external speaker. Uses AT “M” command.
Analog output that can be used to monitor modem activity via an
external audio amplifier.
No Connection
Serial data input from host DTE
Serial data output to host DTE
Pin
I/O
Name
J2-1
J2-2
J2-3
J2-4
I/O
I/O
N/C
TIP
N/C
RING
No Connection
Tip connection to telephone line
No Connection
Ring connection to telephone line
J2-5
-
N/C
No Connection
Rev. 2
Function
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3
CPC2400E
Functional Description
The CPC2400E is a small, full featured, 2400 baud
module intended for embedded applications and is fully
FCC Part 68 approved. The CPC2400E includes a user
transferable FCC registration number which the end
product must display (see section for more details). The
module consists of a Data Access Arrangement (DAA),
V.22bis data pump, and a microcontroller on a 1.00” x
2.50” PCB.
The CPC2400E connects to the telephone lines TIP and
RING leads and must be made through an approved
RJ-11 jack. The CPC2400E supports the industry standard AT command set (see AT Command set section for
further details).
The CPC2400E operates off a single +5V supply and
supports low power modes of operation. When the
device is not in use, it automatically enters sleep mode,
reducing supply current to a minimum. An incoming ring
signal from the phone lines powers up the device (wakeon ring).
An evaluation board is available for testing the
CPC2400E. This evaluation board includes an RS232
line driver, LED status indicators and an amplified speaker circuit. When used with the evaluation board, the
CPC2400E also meets the FCC Part 15B emissions test.
Contact Clare for more information on the CPC2400E
Evaluation Board.
DAA
The DAA portion of the CPC2400E has been designed
to interface directly with the U.S. PSTN as governed by
the FCC. The DAA includes the circuitry for hookswitch,
ring detection, gyrator, surge protection and analog signal coupling transformer. The DAA circuitry provides up
to 1000 VRMS of longitudinal surge protection. For countries using a PSTN similar to the U.S. (Canada, Japan),
the product using the CPC2400E must be submitted to
a suitable test house for approval. Consult Clare for further information.
FCC Part 68: Connecting to the PSTN
1. General
Clare’s CPC2400E complies with FCC Part 68 rules
which regulates equipment connected to the telephone
network. The CPC2400E provides a user transferable
Part 68 registration which means that customers can
use Clare’s registration number for the CPC2400E.
Customers who wish, can reregister the modem under
their name. Reregistration assigns the customer a
unique registration number. No additional FCC Part 68
submittal is required for equipment using Clare’s
CPC2400E module.
4
2. Repairs
The FCC requires that Clare makes all necessary
repairs to the modem. If you are experiencing problems
with the CPC2400E, contact Clare at 1-800-272-5273
for further information. If repairs are necessary after the
modem has been installed in your product and delivered
to your customer, the modem must be returned to you
where the CPC2400E can be removed and sent back to
Clare.
3. Label Instructions
A label similar to the following should be made visible on
the outside of the end user product.
Complies with Part 68 of FCC Rules
Registration Number:
LVRPHL-25931-MD-E
Ringer Equivalence:
0.6B
Required Connection:
RJ-11
4. Design Guidelines
The following design guidelines should be followed to
insure compatibility to FCC Part 68 tests:
4.1. The CPC2400E, the RJ-11 jack and the interface
circuitry must be mounted on a PCB the should meet
UL 94V-0 flammability standard.
4.2. Tip and Ring traces from the CPC2400E to the RJ11 jack should be isolated by a minimum of 1.5mm
(0.06in) to prevent breakdown. Traces must have a minimum width of 0.5mm (.02in).
4.3 Insure that module is securely installed to the host
system. Vibration and drop tests will loosen components that are not securely mounted. One of two methods for securing the module should be used:
4.3.1 Soldered to the main PCB. This method is well
suited for harsh environments where the end product
may be subjected to shock and vibrationas in industrial environments (equipment monitoring, etc.).
4.3.2 Socketed to the main PCB. This method is well
suited for environments where the end product is not
subjected to shock and vibrations as in consumer
applications (set top boxes, etc.).
4.4. Components used must be able to withstand temperature and humidity extremes per FCC Part 68.
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Rev. 2
CPC2400E
4.5. When connecting to the PSTN, an FCC approved
telephone jack must be used in the host system and
must meet the mechanical requirements per FCC Part
68.3 Sub-part F. For RJ-11 jacks, refer to FCC Public
Notice #42269 for a list of approved vendors.
or until you are sure that the equipment is not malfunctioning.
4.6. The supplied FCC Registration Number including
REN must be visible on the outside of the end user
product. See Section 3.
FCC rules prohibit the use of non-hearing aid compatible telephones in the following locations or applications:
5. Exhibit J: User Instructions
Instructions to our customers:
(2) Elevators, highways, tunnels (automobile, subway,
railroad or pedestrian) where a person with impaired
hearing might be isolated in an emergency.
The FCC Part 68 Rules require the following information
(or equivalent) to be provided for the end user product.
FCC Requirements for Consumer Products
This equipment complies with FCC rules, Part 68. On
the,
This equipment may not be used on coin service provided by the telephone company. Connection to party
lines is subject to state tariffs.
(1) All public or semipublic coin-operated or credit card
telephones.
(3) Places where telephones are specifically installed to
alert emergency authorities such as fire, police, or medical assistance personnel.
(4) Hospital rooms, residential health care facilities, convalescent homes, and prisons.
[ ] FRONT side
[ ] BOTTOM side
(5) Workstations for the hearing impaired.
[ ] BACK side
[ ] TOP side
(6) Hotel, moel, apartment lobbies; in stores where telephones are used by patrons to order merchandise; in
public transportation terminals where telephones are
used to call taxis, or to reserve lodging or rental cars.
of this equipment is a label that contains, among other
information, the FCC Registration Number and Ringer
Equivalence Number (REN) for this equipment. If
requested, provide this information to your telephone
company.
The (REN) is useful to determine the quantity of devices
you may connect to your telephone line and still have all
of those devices Ring when your number is called. In
most, but not all areas, the sum of the REN’s of all
devices should not exceed five (5.0). To be certain of
the number of devices you may connect to your line, as
determined by the REN, you should call your local telephone company to determine the maximum REN for
your calling area.
(7) Hotel and motel rooms. At least ten percent of the
rooms must contain hearing aid compatible telephones;
or jacks or plug-in hearing-aid compatible telephones
which will be provided to hearing impaired customers
upon request.
If this equipment causes harm to the telephone network,
the Telephone Company may discontinue your service
temporarily. If possible, they will notify you in advance.
But if advance notice isn’t practical, you will be notified
as soon as possible. You will be advised of your right to
file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or procedures that could
affect the proper operation of your equipment. If they
do, you will be given advance notice so as to give you
an opportunity to maintain uninterrupted service.
If you experience trouble with this equipment, please
contact (your company name) at (your company phone
number) for warranty/repair information. The telephone
company may ask that you disconnect this equipment
from the network until the problem has been corrected
Rev. 2
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5
CPC2400E
Applications
Figure 1 is a schematic of the CPC2400E in a typical
host system application. The host system communicates to the CPC2400E through a standard V.24 serial
interface. Refer to the Pinout and Definitions section for
functional descriptions of the pins. The transmit and
receive data is sent over the TXD and RXD pins. The DCD and -DTR pins are used for handshaking. The
audio output pin, A1 is used for monitoring the analog
data and can be amplified to drive a speaker. The MUTE can be used to enable or disable the speaker.
The ferrite beads FB1 and FB2 may be required to
reduce EMI emissions per FCC Part 15. Determining
the value for the ferrite beads depends solely on the
emissions generated by the end user product.
Figure 2 is a schematic of the CPC2400E in a standalone RS232C configuration. This circuit uses the Linear
Technologies LT1181A RS232 line driver. Note that the
LT1181A line driver inverts the signals. Both figures 1
and 2 are for reference purposes only. Exact component
values should be determined by the user.
+5V
VCC
TXD
RXD
-DCD
-DTR
TIP
HOST
SYSTEM
FB1
CPC2410E
MODEM
-MUTE
RING
FB2
TELEPHONE
LINE
A1
GND
SPEAKER
AUDIO AMP
Figure 1. CPC2400E System Environment
+5V
+5V
17
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
10
11
12
13
VCC
FB1
TXD
RXD
11 TXD
10 RXD
13
12
8
9
15
14
3
LT1181A
TIP
CPC2400E
MODEM
2
FB2
4
5
RING
TELEPHONE
LINE
GND
7
6
18
16
DB25F
RS232 DRIVER
Figure 2. Stand Alone Modem with RS232C Interface
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Rev. 2
CPC2400E
Command lines are typed to the modem from the terminal when the modem is in the Idle or Command state.
The modem does not execute any of the commands in
a command line until after the command line is ended
by the end of line character <CR>. A command line is a
string of char-acters starting with the A and T characters
and ending with a special end of line character, <CR>.
Characters typed before the AT are ignored. Command
lines contain at most 40 characters after the AT, not
counting spaces. The modem does not execute any of
the commands in a command line that is too long.
are decimal (base 10).
To Echo command line characters, use the E1 command.
This character is typed to end a command line. The
value of the <CR> character is stored in S-register S3.
The de-fault is 13, the ASCII carriage return character.
Typing mistakes can be aborted by using a special
Back-Space character, <BS>, after the initial A and T
characters have been entered.
A partial command line can be aborted by typing a CtrlX character. The modem returns an OK result code and
ig-nores the partial AT command line.
AT Command Prefix
Each modem command line begins with the letters A
and T. The modem uses these characters to determine
the data rate and parity of data from the terminal.
A/Repeat Last Command
To repeat the commands in the last command line type
the letters A and / instead of A and T.
<CR>End Of Line Character
When the <CR> character is entered, the modem executes the commands in the command line.
Note: default values in the AT Command Tables are
denoted by bold face type.
Command lines may contain several commands one
after another. The Answer (A), Dial (D), and Go On-Line
(O) commands usually cause any following commands
in the command line to be ignored.
Command Line Execution
The characters in a command line are executed one at
a time. Any unexpected characters, except control characters, stop command line execution and return an
ERROR result code. Unexpected characters include
numbers out-side the range of values accepted by the
command. All control characters in a command line
except Ctrl-X and the special characters such as <CR>
and <BS> are ignored.
The numerical argument of a command is assumed to
be 0 if it was not provided. For example, the commands
ATH<CR> and ATH0<CR> both hang up the telephone
line.
When the modem has executed a command line the
result code of the last command executed is returned to
the terminal. If the value to be written to a modem S-register is outside the range of values accepted by the S-register then its value is set to the nearest allowed value.
Leading zeros in numeric arguments, including S-register numbers, are ignored. For example, ATS1=2 and
ATS01=2 both set S-register S1 to 2.
All numeric arguments, including S-register numbers,
Rev. 2
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7
CPC2400E
AT Command Set
Command
Function and Description
A
The A command makes the modem go off hook and respond to an incoming call. Use this command
after the modem has returned the RING result code.
Answer
If the modems successfully complete the answering process they each return a CONNECT result code
and enter the On-Line state.
If no transmit carrier signal is received from the calling modem within the time specified in S-register S7,
the modem hangs up, returns the NO CARRIER result code, and enters the Idle state.
Any commands following the answer command on the command line are ignored.
This command is aborted if a key is pressed before the answer process is completed, or when DTR is off
if some options in the &Q or &D commands have been used.
B
&C
D
Communication
Standard Option
Data Carrier
Detect Options
Dial
The B command tells the modem which special telephone line modulation standards to use. The
modem can be configured to use:
B0
Use the ITU-T modulation standards for all telephone line data rates. This includes V.22 for the
1200 bps telephone line data rate and V.21 for the 300 bps telephone line data rate.
B1
Not Supported.
&C determines how the modem’s DCD signal relates to the carrier signal from the other
modem. This option takes effect only at the beginning of a telephone line connection. If &C is issued from
the Command state it will not have an immediate effect.
&C0
During asynchronous operation (&Q0 in effect) DCD is on at all times. During synchronous operation (&Q1) DCD reflects the state of the carrier signal from the other modem using S-registers
S9 and S10. This is the default value in North America.
&C1
Reflects the state of the carrier signal from the other modem using S-registers S9 and S10.
The D command makes the modem dial a telephone call according to the digits and dial modifiers in the
dial string following the command. Any commands following the dial string on a command line are
ignored unless the semicolon dial modifier is the last character in the dial string. If the modem was
already off hook when the Dial command was given, the modem dials immediately without trying to
detect a dial tone. Characters other than digits and dial modifiers in a dial string are ignored, but are
counted as characters in the command line buffer.
If line current sensing is enabled, and line current is detected before the modem is taken off-hook when
the modem needs to dial, a NO CARRIER result code is displayed and the modem enters the Idle state. If
the modem does not need to dial (i.e., ATD with no dial string), the modem assumes the call was manually established and attempts to make a connection.
The D command is not valid when the modem is in the On-Line state.
See DIAL MODIFIERS and MODEM RESULT CODES for more information.
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Rev. 2
CPC2400E
AT Command Set
Command
Function and Description
&D
Data Terminal &D determines how the modem responds to the DTR signal from the terminal. The country
Ready Options configuration may prevent the modem from detecting terminal DTR. In this case, the
modem assumes DTR is always on. In North America, terminal DTR is normally detected. If DTR detection
has been prevented, the modem will respond with an ERROR result to this command.
The response to changes in DTR also depends on the &Q and &D commands. This table defines what
happens when DTR goes off for all possible combinations of the &D and &Q commands. To see what
happens when DTR goes on refer to the &Q command. The default value is &D0 in North America:
E
%E
&D0
&D1
&D2
D3
&Q0
None
B
C
D
&Q1
A
B
C
D
A
The modem hangs up the telephone line and issues an OK result code.
B
If in the On-Line state, the modem goes into the Command state and issues an OK result code.
C
The modem hangs up the telephone line and issues an OK result code. Auto-Answer is disabled as
long as DTR stays off.
D
The modem resets.
Command Mode E tells the modem whether or not to echo characters sent from the terminal when the
modem is Character Echo accepting AT commands.
Automatic Retrain
Options
E0
Does not echo characters sent from the terminal.
E1
Echo characters sent from the terminal. This is the default value in North America.
The %E command controls whether the modem will initiate retrain with the other modem during
a telephone line connection during operation in data modes supporting retrain. The modem always
responds to a retrain operation initiated by the remote modem. The modem can be forced to initiate a
retrain by the On-Line (O1) command.
%E0
%E1
&F
Recall Factory
Profile
Do not initiate a retrain.
Initiate a retrain if the datapump indicates one is required.
&F changes these AT command options and S-registers to their default values. The default
values may be changed for use in different countries. The values for North America are:
S-registers
S0=0 S1=0
S2=43
S3=13
S4=10
S8=2
S9=6
S10=14
S11=95
S17=10
S25=5
S28=0
S29=25 S37=0
S6=2 S7=30
S12=50
S5=8
Commands
B1
&G
Rev. 2
Guard Tone Options
E1
M1
P
Q0
V1
X4
&C0
&D0
&G0
&P0
&Q0
%E1
&G tells the modem which guard tone to transmit when the modem is transmitting the high band (i.e.,
answer handshake and answer mode).
&G0
No guard tone. This is the default value in North America.
&G1
550 Hz guard tone (V.22 and V.22bis only)
&G2
1800 Hz guard tone (V.22 and V.22bis only)
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9
CPC2400E
AT Command Set
Command
Function and Description
H
H0
Hang up the telephone line.
H1
Go off hook without answering a telephone call. This may be disabled in countries prohibiting
its use.
&HT
I
10
Hook
PTT Test Command
Identification
The &HT command causes the modem to transmit tones for PTT testing. The test tone is generated
until a character is typed on the modem’s terminal. The country configuration may disable this command. The modem returns an ERROR result if this command is issued.
&HT0-9
EMMF tone for digit n where the command was &HTn.
&HT10
EMMF tone”*”
&HT11
EMMF tone “#”
&HT12
EMMF tone “A”
&HT13
EMMF tone “B”
&HT14
EMMF tone “C”
&HT15
EMMF tone “D”
&HT16
V.21 channel 1 mark
&HT17
V.21 channel 2 marks
&HT18
V.23 1200bps marks
&HT19
V.23 75bps marks
&HT20
V.21 channel 1 spaces
&HT21
V.21 channel 2 spaces
&HT22
V.23 1200bps spaces
&HT23
V.23 75bps spaces
&HT24
V.22 originate mode
&HT25
V.22 answer mode
&HT26
V.22bis originate mode
&HT27
V.22bis answer mode
&HT28
V.25 calling tone
&HT29
550Hz guard tone
&HT30
1800Hz guard tone
&HT31
Silence
The I command asks the modem for information that can be used to determine the modem’s compatibility with other software and to ensure the modem is operating properly.
I0
Display product code. The modem reports its product code to the terminal. The modem produces information text dependent upon its features and capabilities.
I1
Display ROM checksum. The modem reports the value of its ROM checksum. The decimal number displayed is the eight bit sum (from 0 to 255) of all the bytes in ROM.
I2
Test the ROM checksum. The modem checks its ROM to ensure it is correct. The modem
reports a result code indicating whether the ROM is OK or in ERROR.
I3
Display Software Versions. The modem reports the modem controller and data pump software
versions, and the modem controller software release date, to the terminal.
I4
Display Modem Identification. The modem reports a configurable identification message to the
terminal.
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Rev. 2
CPC2400E
AT Command Set
Command
Function and Description
M
The country configuration may disable the speaker. If so, this command will return an
ERROR result.
O
&P
Q
Speaker On/Off
Options
Return to On-Line
Mode
Pulse Dial Make/
Break Ratios
M0
Speaker always off.
M1
Speaker on until carrier detected. This is the default value in North America.
M2
Speaker always on; stays on after carrier is detected.
M3
Speaker off as digits are dialed, but on during ringback and on until carrier signal is detected.
This command returns the modem to the on-line mode. It is frequently used after th escape character
sequence (+++) to resume communication with the remote modem. If handshaking is started, the
modem uses Originate or Answer mode handshaking depending upon whether the modem originated
or answered the telephone call.
O0
Return the modem to the On-Line state from the Command state during a telephone line
connection. The modem starts handshaking if there was no telephone line connection but the
modem was off hook.
O1
Return the modem to the On-Line state and retrain its data pump during a telephone line
connection. The modem starts handshaking if there was no telephone line connection but the
modem was off hook.
Sets cadence of pulse dial. The country configuration may disable this command, forcing particular
pulse dialing parameters. In this event, the modem returns an ERROR result if this command is issued.
&P0
39%/61% make/break ratio and 10 pulses per second when pulse dialing. This is the default
value.
&P1
33%/67% make/break ratio and 10 pulses per second when pulse dialing.
&P2
39%/61% make/break ratio and 20 pulses per second when pulse dialing.
q
&P3
33%/67% make/break ratio and 20 pulses per second when pulse dialing
Result Code
Display Options
This command allows the user to either display result codes or to not display result codes.
Q0
Result codes will be displayed. This is the default value for North America.
Q1
Result codes will not be displayed.
Sn
Set the current
S-register to n
This command sets the current S-register to the value “n” selected by the user. For example, ATS7 will
set the current S-register to S7. Default value is 0. Sn addresses a particular S-register number so
future commands like ? and = will read of write the S-register. Modem reset and the &F command
select S0 as the default S-register.
?
Read an S-Register
This command displays the value of the last S-register named in the Sn command.
=x
Write an S-register
This command writes the value x to the last S-register named in the Sn command. The range of valid
values for x depends upon which S-register is being written. 0 is assumed if no value is given for x.
T
Tone dialing
Selects the tone method of dialing.
V
Result Code Format
Rev. 2
This command changes the format in which result codes are displayed.
V0
All result codes will be displayed as numbers.
V1
All result codes will be displayed as words (verbose form). This is the default value for North
America.
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11
CPC2400E
AT Command Set
Command
Function and Description
X
The X command controls whether or not a busy signal or dial tone should be detected when dialing.
The X command also limits the result codes the modem may return when dialing. The operation of the
X command is configurable for operation in different countries.
Call Progress
X0
Neither busy signal nor dial tone are detected. When a telephone line connection is made the
result code does not indicate the telephone line data rate.
X1
Neither busy signal nor dial tone are detected. When a telephone line connection is made the
result code indicates the telephone line data rate.
X2
Busy signal is not detected. Dial tone is detected. When a telephone line connection is made
the result code indicates the telephone line data rate.
X3
Busy signal is detected. Dial tone is not detected. When a telephone line connection is made
the result code indicates the telephone line data rate.
X4
Both busy signal and dial tone are detected. When a telephone line connection is made the
result code indicates the telephone line data rate. This is the default value in North America.
The @ and W dial modifiers are not affected by the X command. The @ dial modifier may return the
result codes 8 (NO ANSWER) or 7 (BUSY) each time it appears in the dial string. The W dial modifier
may return the result codes 6 (NO DIALTONE) or 7 (BUSY) each time it appears in the dial string.
12
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Rev. 2
CPC2400E
Dial Modifiers
Dial modifiers perform special functions within a dial
command. For example,
ATDT9W1552368!@#71234;<CR>
instructs the modem to use tone dialing (T), to access a
number outside a PBX (9), to wait for dial tone (W), to
dial the number 1552368, to do a hook-flash (i.e. timed
break recall), to wait for quiet answer, and to issue the
PBX transfer code #7 before dialing extension number
1234, then to return to the Command state before initiating the handshake.
Modifier
Function
0-9 A B C D # *
Dialing digits and characters. The digits and characters 0-9 A B C D # * specify what numbers the
modem dials. The characters A B C D # * work only when tone dialing is used, they are ignored when
pulse dialing is used. The characters A, B, C, and D may be disabled in countries prohibiting their use.
P
Pulse dialing. P selects the pulse method of dialing. P can be issued within a dial command or as a
separate command. The default method of dialing is Pulse.
R
Originate a Call in Answer Mode. R makes the modem handshake in answer mode so it can originate
a call to an originate-only modem.
T
Tone dialing. T selects the tone method of dialing. T can be issued within a dial command or as a separate command. The default method of dialing is Pulse.
W
Wait for dial tone. W makes the modem wait for a dial tone before proceeding. If no dial tone is detected the modem hangs up the telephone line and returns the NO DIALTONE result code.
,
Delay Processing of Next Character. A comma (,) makes the modem pause for the length of time in Sregister S8 before processing the next character in a dial string.
@
Wait for Quiet Answer. @ makes the modem listen for 5 seconds of silence before continuing. The
modem will wait up to the length of time in S-register S7. If 5 seconds (configurable by country) of
silence are not detected within the time period in S-register S7, the modem hangs up and returns the
NO ANSWER result code. If 5 seconds of silence are detected, the modem continues processing the
other characters in the dial string.
!
Timed Break Recall (Hookflash). A ! makes the modem hang up the telephone line for the length of
time in S-register S29, then take the telephone line off hook again. This is frequently used to access a
PBX’s call transfer function.
Return to Command State after dialing. A semicolon (;) tells the modem to return to command state
after dialing without breaking the telephone line connection and without handshaking with the other
modem. The semicolon may only be used when calling a voice mail system that permits tones to transmit numbers once a connection has been established.
;
Rev. 2
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13
CPC2400E
Modem S-Registers
The value of an S-register is modified by ATSn =x,
where n is the register number and x is the value to be
stored in that particular register. Each S-register has
three values that may be configured for different countries: a default value, an upper limit and a lower limit.
The values shown in this manual are for North America.
Register
Range
Units
Description
S0
0 - 255
Rings
Set number of rings to auto-answer. The country configuration may disable the
modem’s ability to detect a telephone line ring signal. In this case the modem will
never automatically answer the telephone regardless of the S0 setting. Default = 0
(auto-answer disabled)
S1
0 - 255
Rings
Returns the number of times the phone rings. Default = 0
S2
0 - 255
ASCII
Set Escape Sequence Character. Setting S2 to a value greater than 127 disables the
character escape sequence, preventing the modem from returning to Command
state when in the On-Line state. Default = 43
S3
0 - 127
ASCII
Set the End of Line character. Default = 13
S4
0 - 127
ASCII
Set the Line Feed Character. Default = 10
S5
0 - 127
ASCII
Set the BackSpace Character. Default = 8
S6
2 - 255
Seconds
Delay to Wait Before Performing a Blind Dial. Default = 2 seconds
S7
1 - 255
Seconds
Delay to Wait for Carrier after dialing. Default = 30 seconds
S8
0 - 255
Seconds
Delay to Wait when a Comma Dial Modifier is Processed. Default = 2 sec.
S9
1 - 255
1/10th sec
Time Carrier Must be Present Before Being Recognized. Default = 0.6 sec.
S10
1 - 255
1/10th sec
Delay Between Lost Carrier and Hang Up. Setting S-register S10 to 255 makes the
modem never hang up the telephone line because of a loss of carrier. Default = 14
tenths of a second
S11
50 - 255
msec
Multi-Frequency Tone duration. Default = 95 milliseconds
S12
0 - 255
1/50th sec
Escape Prompt delay time. This is the prompt delay time for escape sequences
from the On-Line state to the Command state. Default = 50 fiftieths of a second
S13
Reserved
Reserved
Reserved
S14
Reserved
Reserved
Reserved
S15
Reserved
Reserved
Reserved
S16
Reserved
Reserved
Reserved
S17
-6 to -43 -
dBm
Set Transmit level. Default = -10 dBm
S18
Reserved
Reserved
Reserved
S19
Reserved
Reserved
Reserved
S20
Reserved
Reserved
Reserved
14
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Rev. 2
CPC2400E
Modem S-Registers
Register
Range
Units
Description
S21
Reserved
Reserved
Reserved
S22
Reserved
Reserved
Reserved
S23
Reserved
Reserved
Reserved
S24
Reserved
Reserved
Reserved
S25
0 - 255
seconds or
1/100 sec.
During synchronous operation with the &Q1 command in effect, S-register S25 is
the number of seconds after a telephone line connection is made before the modem
examines DTR. This allows sufficient time to disconnect the modem from an asynchronous terminal and attach it to a synchronous terminal. In the On-Line or
Command state during any mode of operation, changes in DTR for less than S25
hundredths of a second are ignored.
S26
Reserved
Reserved
Reserved
S27
Reserved
Reserved
Reserved
S28
0 - 255
minutes
Terminal inactivity timeout. Hangs up the modem after S28 minutes if no characters
are received from the modem’s terminal. Default = 0
S29
0 - 255
1/50th sec
Hook Flash On-Hook time. The amount of time in 20 millisecond units the modem
will leave the telephone on-hook while performing a hook-flash according to the “!”
dial string modifier. Default = 25 fiftieths of a second.
S37
0-6
code
Set Highest Line Rate - determines the highest telephone line data rate the modem
will use when connecting with a remote modem. See “Setting the Highest Line
Rate” section below. Default = 0.
Setting the Highest Line Rate
The connect rate can be selected by S-register S37. The following connect rates are supported.
S37
Value
Carrier
0
Data Rate
The data rate of the last AT command
4
Reserved
5
V.22, Bell 212A
1200 bps. See the B command
6
V.22bis
2400 bps
Rev. 2
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15
CPC2400E
Modem Result Codes
A result code is a line of text or a number the modem
sends to the terminal to indicate the result of a command execution. Some CONNECT result codes indicate the telephone line data rate. The following table
provides a list of the available result codes.
16
Number
Word
Result Code Description
0
OK
Command Line Executed without errors
1
CONNECT
The modem is in the On-line state, ready to transfer data.
2
RING
The modem has detected a ring signal on the telephone line. The country configuration
may disable the modem’s ability to detect a telephone line ring signal.
3
NO CARRIER
No carrier signal was detected when answering or placing a telephone call, or carrier
was lost during a call. The modem also returns this response message when the tele
phone line connection is broken for any reason.
4
ERROR
An invalid command was issued, or there was an error at any place in the command line.
5
CONNECT 1200
The modem is in the On-line state, ready to transfer data.
6
NO DIALTONE
No dial tone was detected when the modem took the telephone line off hook.
7
BUSY
The modem detected a busy signal on the telephone line.
8
NO ANSWER
Not enough silence was detected when the @ dial modifier was used.
10
CONNECT 2400
The modem is in the On-line state, ready to transfer data. The telephone line data rate is
2400bps.
16
CONNECT 1200/75
The modem is in the On-Line state, ready to transfer data. This modem transmits at
1200 bps and receives at 75 bps.
17
CONNECT 75/1200
The modem is in the On-Line state, ready to transfer data. This modemtransmits at 75
bps and receives at 1200 bps.
20
BLACKLISTED
The modem will not allow any number to be dialed until after the modem is reset.
21
DELAYED
The modem will not allow any number to be dialed now, but will allow dialing at some
future time.
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Rev. 2
CPC2400E
Escape Sequences
An escape sequence is one or more particular characters
sent from the terminal to the modem during the On-Line
state. This is done to switch the modem to the command
state so modem commands may be entered during a
telephone line connection. The Escape Sequence characters are typically sent to the other modems as data.
An escape sequence should not occur accidentally during an exchange of data between two modems.
Unfortunately, it is impossible to guarantee any escape
sequence will never occur naturally since there are no
restrictions on the data or timing between characters
sent between two modems during the On-Line state.
The only method of switching form the On-Line state to
the Command state that does not ever occur naturally
during an exchange of data is the Data Terminal Ready
signal (the &D1 command). The terminal has complete
control of this signal and it is not part of the data
exchanged between the modems.
Carrier Detection
S-Register S2. The prompt delay timer can be changed
(in 1/50 second increments) through S-Register S12
(see S-Registers section).
After handshaking, the modem determines if a telephone line connection exists by detecting the carrier signal from the other modem. If the carrier is not detected
for a long enough period of time, the modem assumes
the telephone line connection with the other modem has
been broken. The modem uses S-register S9 to determine how long a carrier must be present before it is
“detected.” The modem uses S-register S10 to determine how long a carrier may not be detected before the
telephone line is hung up.
The Hayes escape sequence was adopted by many
modem manufacturers and communication programs
before Hayes was granted a patent for the escape
sequence guard times. Now the unpatented Time
Independent Escape Sequence (TIES) has gained popularity with many modem manufacturers.
TIES Escape Sequence
TIES stands for Time Independent Escape Sequence.
TIES was developed by a number of modem manufacturers in response to Hayes enforcing patent rights for
their escape sequence guard time patent.
The Time Independent Escape Sequence is a sequence
of 3 escape characters (+ characters by default). Once
these characters have been recognized, the modem
enters the Command state without sending a confirming
result code to the terminal and the modem starts a
prompt delay timer.
Then:
a. If one of the recognized AT commands is received
before the timer expires, the timer is stopped, the command is executed and its result code is sent to the terminal.
b. If any other data is received while the timer is running,
the timer is stopped, the modem returns to the On-Line
state and the received data is sent to the other modem.
c. If the timer expires, a confirming result code is sent to
the terminal, indicating the modem is in the Command
state. The escape character can be changed through
Rev. 2
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17
Worldwide Sales Offices
CLARE LOCATIONS
EUROPE
ASIA/PACIFIC
Clare Headquarters
78 Cherry Hill Drive
Beverly, MA 01915
Tel: 1-978-524-6700
Fax: 1-978-524-4900
Toll Free: 1-800-27-CLARE
European Headquarters
CP Clare nv
Bampslaan 17
B-3500 Hasselt (Belgium)
Tel: 32-11-300868
Fax: 32-11-300890
Clare Micronix Division
145 Columbia
Aliso Viejo, CA 92656-1490
Tel: 1-949-831-4622
Fax: 1-949-831-4628
France
Clare France Sales
Lead Rep
99 route de Versailles
91160 Champlan
France
Tel: 33 1 69 79 93 50
Fax: 33 1 69 79 93 59
Asian Headquarters
Clare
Room N1016, Chia-Hsin, Bldg II,
10F, No. 96, Sec. 2
Chung Shan North Road
Taipei, Taiwan R.O.C.
Tel: 886-2-2523-6368
Fax: 886-2-2523-6369
SALES OFFICES
AMERICAS
Americas Headquarters
Clare
78 Cherry Hill Drive
Beverly, MA 01915
Tel: 1-978-524-6700
Fax: 1-978-524-4900
Toll Free: 1-800-27-CLARE
Eastern Region
Clare
P.O. Box 856
Mahwah, NJ 07430
Tel: 1-201-236-0101
Fax: 1-201-236-8685
Toll Free: 1-800-27-CLARE
Central Region
Clare Canada Ltd.
3425 Harvester Road, Suite 202
Burlington, Ontario L7N 3N1
Tel: 1-905-333-9066
Fax: 1-905-333-1824
Western Region
Clare
1852 West 11th Street, #348
Tracy, CA 95376
Tel: 1-209-832-4367
Fax: 1-209-832-4732
Toll Free: 1-800-27-CLARE
Canada
Clare Canada Ltd.
3425 Harvester Road, Suite 202
Burlington, Ontario L7N 3N1
Tel: 1-905-333-9066
Fax: 1-905-333-1824
Germany
Clare Germany Sales
ActiveComp Electronic GmbH
Mitterstrasse 12
85077 Manching
Germany
Tel: 49 8459 3214 10
Fax: 49 8459 3214 29
Italy
C.L.A.R.E.s.a.s.
Via C. Colombo 10/A
I-20066 Melzo (Milano)
Tel: 39-02-95737160
Fax: 39-02-95738829
Sweden
Clare Sales
Comptronic AB
Box 167
S-16329 Spånga
Tel: 46-862-10370
Fax: 46-862-10371
United Kingdom
Clare UK Sales
Marco Polo House
Cook Way
Bindon Road
Taunton
UK-Somerset TA2 6BG
Tel: 44-1-823 352541
Fax: 44-1-823 352797
http://www.clare.com
Clare cannot assume responsibility for use of any circuitry other
than circuitry entirely embodied in this Clare product. No circuit
patent licenses nor indemnity are expressed or implied. Clare
reserves the right to change the specification and circuitry, without notice at any time. The products described in this document
are not intended for use in medical implantation or other direct life
support applications where malfunction may result in direct physical harm, injury or death to a person.
Specification: DS-CPC2400E-R2
©Copyright 2000, Clare, Inc.
All rights reserved. Printed in USA.
1/12/01