ETC PCSER4

J228 PCSER4
2192-09375-000-000
PCSER4
Serial Communications Board
Technical Manual
Contents
Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Preface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Packing list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Utility Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Handling (ESD/Packaging) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Contacting Arcom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
I/O Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Programming the SCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Default Link Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RS232/422 and 485 Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
User Configuration Record Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
D-50 Output Connector (PL2) Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation for CE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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2192-09375-000-000
J228 PCSER4
Revision
Manual
Issue B
Issue C
Issue D
Issue E
PCB
V2 Iss 1
V3 Iss 1
V3 Iss 1
V3 Iss 1
960723
970818
980116
980608
Shortened Version first published
ECO2184
ECO2684
ECO2749
Preface
Packing List
This product is shipped as follows:
• Board
• User Manual
• Utility Disk
If any of the above appear to be missing, please telephone Arcom 01223 411200.
Utility Disk
This product is shipped with a utility disk which contains:
• PCbus library manual
• Source Code for all PCbus I/O boards
• A test program called EXAMP-01.EXE
Handling (ESD/Packaging)
This board contains CMOS devices which could be damaged in the event of static electricity being discharged
through them. At all times please observe anti-static precautions when handling the board and always unpack
and install the board in an anti-static working area.
Please ensure that should a board need to be returned to Arcom, it is adequately packed and if a battery is
fitted, that it is isolated.
Product Information
Full information about other Arcom products is available via the Fax-on-Demand System, (Telephone numbers
are listed below), or by contacting our Website at: www.arcom.co.uk, or for the US,
www.arcomcontrols.com
Additional useful contact information:
Customer Support: (tel) +44 (0)1223 412428, (fax) +44 (0)1223 403400, (email) [email protected]
Sales: (tel) +44 (0)1223 411200, (fax) +44 (0)1223 410457, (email) [email protected], or for the US,
[email protected]
United Kingdom
Arcom Control Systems Ltd
Clifton Road
Cambridge
CB1 4WH
UK
tel: +44 (0)1223 411200
fax: +44 (0)1223 410457
FoD: 01223 240600
United States
Arcom Control Systems Inc
13510 South Oak Street
Kansas City, MO 64145
USA
tel: (toll free) 888-941-2224
fax: 816-941-7807
FoD: 800-747-1097
France
Arcom Control Systems
Centre d’affaires SCALDY
23, rue Colbert
7885 SAINT QUENTIN
Cedex, FRANCE
tel:(Numero Vert) 0800 90 84 06
fax:(Numero Vert) 0800 90 84 12
FoD:(Numero Vert) 0800 90 23 80
Germany
(Kostenlose Infoline:)
tel: 0130 824 511
fax: 0130 824 512
FoD: 0130 860 449
Italy
(Numeroverde:)
FoD: 1678 73600
Belgium
(Groen Nummer:)
tel: 0800 7 3192
fax: 0800 7 3191
Netherlands
(Gratis 0800 Nummer:)
tel: 0800 022 11 36
fax: 0800 022 11 48
The choice of boards and systems is the responsibility of the buyer, and the use to which they are put cannot be the liability
of Arcom Control Systems Ltd. However, Arcom’s sales team is always available to assist you in making your decision.
© 1996 Arcom Control Systems Ltd.
Arcom Control Systems Ltd is a subsidiary of Fairey Group plc.
Specifications are subject to change without notice and do not form part of any contract.
All trademarks recognised.
Arcom Control Systems Ltd operate a company-wide quality management system which has been
certified by the British Standards Institution (BSI) as compliant with ISO9001:1994
Page 2
J228 PCSER4
2192-09375-000-000
Introduction
The PCSER4 is an 8-bit ISA bus add-on board providing 4 channels of RS232/485 Serial
Comms. It is based on the 85230 Enhanced Serial Communications Controller and is capable of
RS232, RS422 or RS485 signalling standards. Every channel can be independently configured
for and synchronous protocols, baud rate and signalling standard. High speed asynchronous
communications can be achieved up to 115kBaud (asynchronous) or 1.8Mbaud (synchronously).
All serial channel connections are routed through the 50-way metal-shelled ‘D’-type connector.
Features
• CE compliant design
• 4 serial channels
• Link-selectable interrupts (IRQ 2,3)
• 8-bit bus interface
• User-controlled LED
• Powerful and versatile 85230 Enhanced Serial Communications Controller
• Differential RS485/422
• Arcom standard 50-way ribbon cable connection
• Diagnostic facilities: Access LED and board ID code readable via a fixed offset in the I/O map
• Operating temperature range, +5°C to +55°C
• Power consumption from the host, max 300mA @ +5V, 60mA @ +12V
• MTBF: 180,000 hours (using generic figures from MIL-HDBK-217F at ground benign),
50mA @ -12V
Getting Started
• Switch off PC
• Install board in supplied configuration
• Switch on PC
• Run EXAMP-01.EXE (supplied on the utility disk)
• An access or user LED should flash. If not check default link configuration. (Page 7)
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J228 PCSER4
Operation
I/O Map
The I/O Pointer Scheme
To access a register on the PCSER4 you must first set up a pointer to it, by writing a byte to the
'base address' of the PCSER4. After that, you can read from and write to the register that is
pointed to, by accessing the byte at the base address + 1. The base address is set up using
LKA9-LKA1. The board occupies only two bytes on the PCbus I/O space. The base address
must be set to an even location.
In order to allow standardisation of software some register addresses have been defined for all
Arcom PCbus I/O boards. In particular, the top half of the 256 byte space has been defined as
'special function' register space, and the bottom half as 'I/O' register space.
The next two sub-sections describe the register allocations in detail.
The Registers on PCSER4: Table 1 - Indexed I/O Registers
Pointer Value
(hex)
10
10
Read/Write
Register Name
Comments
Write
INTP
Pulse Interrupt Line
Read
INT
Interrupting Device
08-0F
not used
07
Read/Write
D4
Channel 4 Data
06
Write
C4
Channel 4 Control
06
Read
S4
Channel 4 Status
05
Read/Write
D3
Channel 3 Data
04
Write
C3
Channel 3 Control
04
Read
S3
Channel 3 Status
03
Read/Write
D2
Channel 2 Data
02
Write
C2
Channel 2 Control
02
Read
S2
Channel 2 Status
01
Read/Write
D1
Channel 1 Data
00
Write
C1
Channel 1 Control
00
Read
S1
Channel 1 Status
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J228 PCSER4
2192-09375-000-000
The Registers on PCSER4: Table 2 - Indexed Special Functions
Pointer Value
(hex)
81
80
Read/Write
Register Name
Comments
Read
Board Ident
Reading this should always give a
value of 10 (hex) for the PCSER4
Write
User LED
Writing 01 switches the green LED on.
Writing 00 switches it off
How to Write to the Registers
It is useful to remember that the pointer register only needs to be written to once, if only one
register is read or written. This means that I/O can be done with byte reads and writes. However,
if your program is continually changing registers, it must write a new pointer value each time it
accesses a new register. This can be done by writing a pair of bytes as a word, because the
CPU in a PC does word writes to the bus by writing the lower byte first, this setting up the
pointer register first.
Programming the SCC
Introduction
The SCC is a versatile and powerful device and as such requires careful initialisation. For this
reason, it is strongly recommended that the SCC manufacturer’s manual is used. This may be
obtained by calling Arcom Technical Support on +44 (0) 1223 410 457. It should be noted that it
is not software-compatible with the PC 8250-type UART.
The order in which registers are initialised is important and a register may need to be accessed
more than once during initialisation. It is not worth taking short cuts, or unreliable operation may
result. For examples of basic SCC initialisation, please refer to the programs on the utility disk.
Each SCC occupies four I/O locations in the PCSER4’s indexed I/O map; two consecutive
locations per channel. The lower address of each pair is the control and status register, which is
also multiplexed with the control/status pointer register; the higher address of each pair contains
data transmit and receive latches.
Like the PCSER4, the SCC itself has an indexed register scheme for the status and control
registers, but not for the serial data registers themselves. The important difference here is that
because the register pointer latch occupies the same I/O location as the control and status
registers themselves, the pointer latch always has to be written before each register data write
or read. The one exception to this rule is status register 0, which can be read without having to
write ‘0’ first.
Initialising SCC Control Registers
From the above, it can be seen that initialising an SCC channel involves the following steps:
i. Write the address, in the PCSER4’s indexed I/O map, of the desired channel’s control/status
register to the base address of the PCSER4. See Table 1 - Indexed I/O Registers
ii
Write the SCC’s control register number to the PCSER4 base address +1
iiii Write the new register contents to the PCSER4 base address + 1
iv
Repeat steps (ii) and (iii) for each of the SCC registers until all have been initialised
Transmitting and Receiving Data
The tables show the steps required to transmit and receive data in polled mode.
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J228 PCSER4
Table 3: Transmit Data
Explanation
Command
Sets up the PCSER4 for the SCC read register 0 (status) on
channel 0
Write 02 to 180H (the pointer register)
Read from 181H (the data register)
Reads status
Logically AND the value read with 4
A result of 4 means the Tx buffer is empty, so another byte can
be sent. If not, loop back to the read at 181H
Sets up the PCSER4 for an access to the SCC data register on
channel 2
The byte goes to the transmit buffer and is sent
Write 03 to 180H (the pointer register)
Write data byte to be transmitted to 181H (the data register)
Table 4: Receive Data
Explanation
Command
Sets up the PCSER4 for the SCC read register 0 (status) on
channel 2
Write 02 to 180H (the pointer register)
Read from 181H (the data register)
Read status
Logically AND the value read with 1
A result of 1 means that there is a byte in the receive register.
If not, loop back to the read at 181H
Sets up the PCSER4 for an access to the SCC data register
channel 2
Reads Serial Data.
Write 03 to 180H (the pointer register)
Read from the data register
Baud Rates
The SCC has one 16-bit baud rate counter per channel for both receive and transmit, so both
run at the same baud rate. In asynchronous mode, the clock must be used in a x16 mode, so
the baud rate calculation is:
time constant
= 230400
baud rate
-2
Typical baud rates and their time constants are:
Table 5: Typical Baud Rates
Baud
TC
115200
0
38400
4
19200
10
9600
22
The 16-bit counter is set up by writing the lower byte of the time constant to SCC register 12
(decimal) and the upper byte to register 13 (decimal). The baud rates above all have time
constants of less than 256, so their upper bytes are all zero.
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J228 PCSER4
2192-09375-000-000
Links
Default Link Positions
TP3
TP2
LKA8
LKA7
LKA9
LKA6
LKA5
LKA4
LKA3
LKA2
Link Position Diagram (Default Base Address = 180H)
A
A
B
A
B
B
LK14A
LK24A
A
B
A
B
LK34A
LK44A
A
B
LKB5
LKB4
LKB3
LKB2
LKB1
LKA1
TP1
Address Links LKA9-LK1
Links LKA9-LKA1
Links LKA9 to LKA1 correspond to the address lines within the PC. This allows the user to set the
board on any even two byte boundary. Making a link sets the address line high, hence the default
link setting LKA8 and LKA7 made gives the address 180H. All the address links are grouped
together at the top left-hand corner of the board with the exception of LKA1 which will be found
close to the ISAbus connector and IC17.
Address line:
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Hex value:
2
1
8
4
2
1
8
4
2
1
Address link:
LKA9
LKA8
LKA7
LKA6
LKA5
LKA4
LKA3
LKA2
LKA1
-
Default base:
-
+
+
-
-
-
-
-
-
+ Indicates link fitted.
There are four functions defined by links on the PCSER4: whether the serial lines are RS232 or
RS485/422 (and how some of them are connected); where the interrupts go to on the PC;
synchronous clock sourcing; and receiver enabling/disabling.
The first of the link number refers to the serial channel, as defined in the I/O map. Thus LK13 refers
to channel 1. The links define whether some of the lines connecting to the SCC for that channel
are at RS232 or RS485/422 levels, and in some cases which lines go to the 50-way
connector.(Refer to the table below). The reason why some lines on the 50-way connector change
function is because RS485/422 is a differential (2-wire) system, whereas RS232 is single-ended
and uses one wire per function.
Some of the serial lines are not affected by these links. This is either because they have a
connection on the 50-way connection, which is not shared with a different function or level, or
because the device can operate at either level.
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2192-09375-000-000
J228 PCSER4
RS232/RS485 and 422
Table 6: Serial Signal Configuration
Link
Channel
LK10
1
Ribbon Cable
Wire Number
9
A position:
RS232
DTR out
B position:
RS485/422
DCD- in
LK11
1
8
CTS out
LK12
1
4
TX out
TX+ out
LK13
1
7
RTS out
DTR- out
LK20
2
19
DTR out
DCD- in
LK21
2
18
CTS in
DTR+ out
LK22
2
14
TX out
TX+ out
LK23
2
17
RTS out
DTR- out
LK30
3
29
DTR out
DCD- in
LK31
3
28
CTS in
DTR+ out
LK32
3
24
TX out
TX+ out
LK33
3
27
RTS out
DTR- out
LK40
4
39
DTR out
DCD- in
LK41
4
38
CTS in
DTR+ out
LK42
4
34
TX out
TX+ out
LK43
4
37
RTS out
DTR- out
DTR+ out
Interrupts: Link 2
LK2A
Sends the interrupt from the SCCs to PCbus IRQ3
LK2B
Sends the interrupt from the SCCs to PCbus IRQ2
No jumper means that the PCSER4 cannot generate any interrupts.
If you intend to use the Arcom driver software, it may be necessary to insert a jumper into one of
these link positions.
We recommend that you only insert a jumper into LK2, if you intend to use interrupts from the
SCCs and are experienced at writing PC interrupt-handling software.
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J228 PCSER4
2192-09375-000-000
Synchronous Clocks RS232/422 and 485 Switching and Receiver Disabling
There are four groups of nine pins: each group is a three-pin, two-position link. They are called
LK14A-C, LK24A-C, LK34A-C and LK44A-C. The first digit of the link number refers to the
channel; the letter refers to the function.
The 'A' links control receiver enables. If a link is inserted in position A on one of these links, the
receive buffer is enabled when RTS is active. If the jumper is in position B, the receive buffer is
permanently enabled.
The 'B' links change the function of the wires 3, 13, 23, 33 of the ribbon cable. In position A they
connect the wires to the RS485 transmitted data; in position B they connect the wires to the
85230 TRXC clock inputs via RS232 buffers.
The 'C' links change the function of the wires 5, 15, 25, 35 of the ribbon cable. In position A they
connect the wires to the RS485 received data; in position B they connect the wires to the 8530
TRXC clock inputs via RS232 buffers.
LK14A
A
Rx buffer enabled when RTS active
LK14A
B
Rx buffer is permanently enabled
LK14B
A
Pin 3 of PL2 connects to RS485 Tx data
LK14B
B
Pin 3 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
LK14C
A
Pin 5 of PL2 connects to RS485 Rx data
LK14C
B
Pin 5 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
LK24A
A
Rx buffer enabled when RTS active
LK24A
B
Rx buffer is permanently enabled
LK24B
A
Pin 13 of PL2 connects to RS485 Tx data
LK24B
B
Pin 13 of PL2 connects to 8530 TRXC clock inputs via RS232 buffers
LK24C
A
Pin 15 of PL2 connects to RS485 Rx data
LK24C
B
Pin 15 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
LK34A
A
Rx buffer enabled when RTS active
LK34A
B
Rx buffer is permanently enabled
LK34B
A
Pin 23 of PL2 connects to RS485 Tx data
LK34B
B
Pin 23 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
LK34C
A
Pin 25 of PL2 connects to RS485 Rx data
LK34C
B
Pin 25 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
LK44A
A
Rx buffer enabled when RTS active
LK44A
B
Rx buffer is permanently enabled
LK44B
A
Pin 33 of PL2 connects to RS485 Tx data
LK44B
B
Pin 33 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
LK44C
A
Pin 35 of PL2 connects to RS485 Rx data
LK44C
B
Pin 35 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
IMPORTANT: These signals are at TTL levels, not RS232 or RS422/485. Connecting RS232
or RS422/485 to these pins with a link inserted, will destroy the SCC.
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J228 PCSER4
User Configuration Record Diagram
This sheet may be duplicated
B
A
TP1
B
A
LK44A
B
B
B
A
A
A
LK34A
LK24A
B
A
LK14A
TP2
TP3
LKA9
LKA8
LKA7
LKA6
LKA5
LKA4
LKA3
LKA2
Page 10
B
LKA1
LKA1
LKA2
LKA3
LKA4
LKA5
LKA6
LKA7
LKA8
LKA9
A
LKB5
LKB4
LKB3
LKB2
LKB1
Link
LK10
LK11
LK12
LK13
LK20
LK21
LK22
LK23
LK30
LK31
LK32
LK33
LK40
LK41
LK42
LK43
LK2
LK14A
LK14B
LK14C
LK24A
LK24B
LK24C
LK34A
LK34B
LK34C
LK44A
LK44B
LK44C
J228 PCSER4
2192-09375-000-000
Connectors
D-50 Output Connector (PL2) Pin Assignments
Because most people will use ribbon cables with this board, the D-50 pin assignments are
shown with the corresponding ribbon cable number, 1 to 50. For ease of reference, the
corresponding ‘D’- type connector pins are shown on the circuit diagram. The pin-out conforms
to the Arcom Signal Conditioning System (SCS).
Table 7: Cable Connections
Ribbon Cable No.
D-50 Pin No.
Signal Title
RS232
RS485/422
1
1
0V
2
34
0V
3
18
4
2
5
35
6
19
Rx
RxA
7
3
RTS
DTRB
8
36
CTS
DTRA
9
20
DTR
10
4
11
37
12
21
13
5
14
38
15
22
16
6
Rx
RxA
17
39
RTS
DTRB
18
23
CTS
DTRA
19
7
DTR
DCDB
20
40
CH2 DCD
DCDA
21
24
22
8
23
41
24
25
25
9
26
42
Rx
RxA
27
26
RTS
DTRB
28
10
CTS
DTRA
29
43
DTR
DCDB
30
27
CH3 DCD
DCDA
31
11
32
44
33
28
34
12
35
45
36
29
Rx
RxA
37
13
RTS
DTRB
38
46
CTS
DTRA
39
30
DTR
DCDB
40
14
CH4 DCD
DCDA
41
47
42
31
43
15
Not Used
44
48
Not Used
45
32
Not Used
46
16
Not Used
47
49
-12V
48
33
+12V
49
17
+5V
50
50
+5V
TxB
Tx
TxA
RxB
DCDB
CH1 DCD
DCD
0V
SYNA0
TxB
Tx
TxA
RxB
0V
SYNB0
TxB
Tx
TxA
RxB
0V
SYNA1
TxB
Tx
TxA
RxB
0V
SYNB1
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J228 PCSER4
Installation for CE Compliance
To maintain compliance with the requirements of the EMC Directive (89/336/EEC), this product
must be correctly installed. The PC in which the board is housed must be CE compliant as
declared by the PC manufacturer. The type of external I/O cable can be chosen according to the
notes below:
1.
Remove the cover of the PC observing any additional instructions of the PC manufacturer
2.
Locate the board in a spare ISA slot and press gently but firmly into place
3.
Ensure that the metal bracket attached to the board is fully seated
4.
Fit the bracket clamping screw and firmly tighten this on the bracket
NOTE: Good contact of the bracket to chassis is essential
5.
Replace the cover of the PC observing any additional instructions of the PC manufacturer
Cable
Cable length 1Metre or less
:
Ribbon cable satisfactory
Cable length up 1M to 3M
:
Commercial screened cable gives the protection required
Longer cable or noisy environment :
Use fully screened cable with metal backshells
e.g. Arcom CAB50CE
The following standards have been applied to this product:
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BS EN50081-1: 1992
Generic Emissions Standard, Residential, Commercial, Light Industry
BS EN50082-1: 1992
Generic Immunity Standard, Residential, Commercial, Light Industry
BS EN55022 : 1995
ITE Emissions, Class B, Limits and Methods
J228 PCSER4
2192-09375-000-000
Circuit Diagrams
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J228 PCSER4
J228 PCSER4
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2192-09375-000-000
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J228 PCSER4