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Interface Converter
K3SC
CSM_K3SC_DS_E_4_2
A compact converter that allows
communications between RS-232C/USB and
RS-422/485 devices. Ideal for industrial
applications.
• Allows communications between RS-232C/USB (Universal
Serial Bus) and RS-422/485 devices.
• Applicable in FA environments: Has passed environment
resistance tests equivalent to those for control devices.
• CE marking (except for USB).
• UL/CSA certification (mark license recognition).
• Compact 30-mm-wide body supports both screw-mounting and
DIN track mounting.
• Operation either with or without echoback available.
• Functionality to convert between USB and RS-232C
communications added.
• USB driver providing virtual communications port for USB
communications is available.
Note: To use USB communications, the USB driver for the K3SC must be
downloaded from the OMRON web site.
Refer to Safety Precautions on page 8.
Application Examples
• Data can be transferred between computers (using the USB port if
there is no RS-232C port) and field devices.
• Using two K3SC Units enables long-distance communications between
devices connected via RS-232C.
Ordering Information
■ List of Models
Appearance
Size (mm)
30 × 80 × 78 (W × H × D)
Power supply voltage
Model
100 to 240 VAC
K3SC-10 100 to 240 VAC
24 VAC/VDC
K3SC-10 24 VAC/VDC
1
K3SC
■ Accessories (Order Separately)
Adapter for RS-232C Serial Cable and K3SC (D-Sub, 9-pin, male)
Appearance
Wiring diagram
Model
K32-23209
D-Sub, 9-pin
Send data
50
Receive data
Signal ground
Request to send
Clear to send
Data set ready
Data terminal ready
Pin
3
2
5
7
8
6
4
Signal
SD
RD
SG
RS
CS
DR
ER
M3.5 terminals
SD (orange)
RD (white)
SG (gray)
Specifications
■ Ratings
Item
K3SC-10 100 to 240 VAC
Supply voltage
100 to 240 VAC 50/60 Hz
Operating voltage range
85% to 110% of power supply voltage
Power consumption
5 VA max.
Master/slave device communications format Master Device
(Select one of the formats listed on the right RS-232C or USB
RS-232C or USB
using the DIP switch.)
USB
K3SC-10 24 VAC/VDC
24 VAC 50/60 Hz, 24 VDC
3 VA max./3 W max.
Slave Device
RS-485, half duplex
RS-422, full duplex
RS-232C, full duplex
Communications method
Start-stop synchronization
Ambient operating
temperature
RS-232C
–10 to 55 °C (with no icing)
USB
0 to 55 °C (with no icing)
Ambient operating humidity
25% to 85% (with no condensation)
Ambient storage temperature
–20 to 65 °C
2
K3SC
■ Characteristics
Slave device
Master device
Item
Specification
RS-232C
interface
(See note 1.)
Maximum transmission 15 m
distance
USB interface
(See note 2.)
Maximum transmission 5 m; hub delay time + cable delay time ≤ 70 ns
distance
RS-485
interface
Maximum number of
connectable Units
Maximum number of
connectable Units
1 Unit
USB standard
V1.1
Maximum transmission 500 m
distance
Maximum number of
connectable Units
RS-422
interface
1 Unit
31 Units (for multi-drop connection)
Maximum transmission 500 m
distance
Maximum number of
connectable Units
1 Unit
Baud rate
1,200/2,400/4,800/9,600/19,200/38,400 (bps)
Default setting: 9,600
Data length
7/8 bits
Default setting: 7
Stop bit length
1/2 bits
Default setting: 2
Communications parity
None/even/odd
Default setting: Even
Echoback selection
Echoback: With/without
Default setting: Without
Selection switch response delay
Approx. 30 ms
Insulation resistance
20 MΩ min. measured at 500 VDC between the following:
External terminals ↔ casing
RS-232C terminals and USB port ↔ RS-422/485 terminals ↔ power supply terminals
Isolation
method
Communications
Phototransistor coupler
Power
supply
Isolating transformer
Dielectric strength
1,500 VAC for 1 minute measured between the following:
External terminals ↔ casing
RS-232C terminals, USB port, RS-422 terminals, and RS-485 terminals ↔ power supply terminals
500 VAC for 1 minute measured between the following:
RS-232C terminals and USB port ↔ RS-422 terminals and RS-485 terminals
AC power supply terminals, normal/common mode: ±1,500 V
AC/DC power supply terminals, normal mode: ±480 V; common mode: ±1,500 V
Square wave with 1-ns rising edge ±1 μs, ±100 ns
Noise immunity
Vibration resistance
Shock resistance
Malfunction
10 to 55 Hz, 0.5-mm single amplitude for 10 minutes each in X, Y, and Z directions
Destruction
10 to 55 Hz, 0.75-mm single amplitude for 2 hours each in X, Y, and Z directions
Malfunction
98 m/s2 3 times each in X, Y, and Z directions
Destruction
294 m/s2 3 times each in X, Y, and Z directions
Front panel operation
parts
Conforms to IEC standards, equivalent to IP20 (when terminal cover mounted)
Weight
Degree of protection
(See note 3.)
Approx. 150 g
Terminals
EMC
Equivalent to VDE 0106/100 (when terminal cover mounted)
(EMI)
Emission Enclosure:
Emission AC Mains:
(EMS)
Immunity ESD:
Immunity RF-interference:
Immunity Fast Transient Noise:
Immunity Burst Noise:
Immunity Surge:
Immunity Conducted Disturbance
Immunity Voltage Dip/Interrupting
EN61326-1
Industrial electromagnetic environment
CISPR 11 Group 1 class A: CISRP16-1/-2
CISPR 11 Group 1 class A: CISRP16-1/-2
EN61326-1
Industrial electromagnetic environment
EN61000-4-2:
4 kV contact discharge (level 2)
8 kV air discharge (level 3)
EN61000-4-3:
10 V/m (amplitude-modulated,
80 MHz to 1 GHz) (level 3)
EN61000-4-4:
2 kV (power line) (level 3)
1 kV line to line (I/O signal line)
EN61000-4-5:
1 kV line to line
2 kV line to ground (power line)
EN61000-4-6:
3 V (0.15 to 80 MHz) (level 2)
EN61000-4-11:
0.5 cycles, 0, 180°, 100% (rated voltage)
Approved standards
UL508,
Conforms to EN61326-1, EN61010-1 (IEC61010-1)
Memory protection
No protective functions (Communications data is not protected for power interruptions during communications.)
Note: 1. With RS-232C communications, free-run mode is supported for SD and RD but not for any other signal lines.
2. To use USB communications, the USB driver for the K3SC must be downloaded from the OMRON web site.
http://www.fa.omron.co.jp/
3. The enclosure ratings do not apply when USB is used.
4. The CE marking does not apply when the K3SC is used for USB.
3
K3SC
Connections
■ Terminal Specifications
Be sure to check the input and output specifications for the signal pins of connected devices before connecting the terminals.
Function
Terminal
number
Name
Signal direction
Explanation
For connecting the
operating power supply
1 and 4
PWR
---
The input power supply specifications vary with the model.
A 100 to 240-VAC model and a 24-VAC/VDC (no-polarity) model are available.
Connection terminals for
RS-232C
communications with
master device
(DIP switch pin 8: OFF)
3
SG
---
Connect to signal ground.
5
SD
Input
Receives data from SD of the master device.
6
RD
Output
Sends data to RD of the master device.
Used for RS-485
8
communications with slave 9
device
(DIP switch pin 9: OFF)
11
RDA(−)
Input/output
SD and RD for RS-485 (cold side)
Terminals 8 and 9 are connected internally when pin 9 of the
DIP switch is set to OFF.
Input/output
12
SDB(+)
SD and RD for RS-485 (hot side)
Terminals 11 and 12 are connected internally when pin 9 of the
DIP switch is set to OFF.
SG
---
Connect to signal ground.
RDA(−)
Input
Receives RS-422 data and outputs it to the master side.
SDA(−)
Output
Converts data received via RS-232C from the master device to
RS-422 data and outputs the data.
SDA(−)
RDB(+)
Used for RS-422
7
communications with slave 8
device
9
(DIP switch pin 9: ON)
11
RDB(+)
Input
Receives RS-422 data and outputs it to the master side.
12
SDB(+)
Output
Converts data received via RS-232C from the master device to
RS-422 data and outputs the data.
Note: Terminals 2 and 10 are not used.
■ Internal Configuration (Block Diagram)
Status
indicator
DIP switch
Indicator control
Switch input
RS-232C
RS-232C
driver
Power
indicator
Serial
communications
Serial
communications
CPU
Power
supply
PHC
RS-485 driver
RS-422 or
RS-485
PHC
RS-485 enabling
control
PHC
USB
USB
controller
USB control
Insulation
4
K3SC
■ External Connections
RS-485 Connection
RS-422 Connection
Slave device side
RS-485
K3SC
7
8
9
10
11
12
(See note 1.)
(See note 1.)
Input power supply
(See note 2.)
1
5
6
SD
RD
2
3
SG
Abbreviation
SG
SDA (−)
SDB (+)
RDA (−)
RDB (+)
(−)
(+)
7
Master device side
RS-232C
4
Slave device side
RS-422
K3SC
Abbreviation
SD
RD
SG
RS
CS
DR
ER
8
9
SG RDA (−) SDA (−)
10
11
12
RDB (+) SDB (+)
Pin number (for 9-pin
computer connector)
3
2
5
7
8
6
4
Master device side
RS-232C
4
Input power supply
(See note.)
Note: 1. If RS-485 is selected as the communications method (i.e.,
pin 9 of the DIP switch is set to OFF), terminals 8 and 9, and
terminals 11 and 12 are connected internally.
2. Either a 100 to 240-VAC or 24-VAC/VDC (no polarity) input
power supply is used.
1
5
6
SD
RD
2
Abbreviation
SD
RD
SG
RS
CS
DR
ER
3
SG
Pin number (for 9-pin
computer connector)
3
2
5
7
8
6
4
Note: Either a 100 to 240-VAC or 24-VAC/VDC (no polarity) input
power supply is used.
Connecting an RS-232C or USB Master Device to an RS-422/485 Slave Device
First set the same communications conditions (baud rate, stop bits, data length, and parity) for the master device, the Interface Converter, and
slave devices.
Devices connected
via RS-485 (example)
If the communications interface format
for the master device is RS-232C, set
pin 8 of the DIP switch to OFF.
AL1
AL2
HB
OT1 STP
OT2 CMW
Wire with
stranded wires.
Computer
K3SC
In addition to the required communications
conditions, set the communications number.
Note: To allow connection using a commercially available cable with an
RS-232C D-sub connector, a connection adapter (D-sub, 9-pin) is
available. (Order separately; model number: K32-23209.)
Cable with RS-232C D-sub connector
Note: With RS-485 communications, connect a terminating resistance (120 Ω, 1/2 W recommended) to both ends of the communications path.
K32-23209
Note: 1. 1-to-N connection via OMRON NT Link communications is not supported.
2. If the communications interface format for the master device is USB, obtain a commercially available USB cable and download the USB
driver for the K3SC from the OMRON web site.
Connecting a USB Master Device to an RS-232C Slave Device
First set the same communications conditions (baud rate, stop bits, data length, and parity) for the master device, the Interface Converter, and
slave devices.
Note: There is no isolation between the USB and RS-232C sides.
Set pin 8 of the DIP switch to ON to select
the following communications format:
Master device: USB; Slave device: RS-232C
RS-232C
USB connection
Note: Use a commercially available USB cable.
K3SC
Measuring/testing device
Computer
Note: The USB driver is available
from the OMRON web site.
http://www.fa.omron.co.jp/
Wire with stranded wires.
5
K3SC
Operation
■ Communications Settings Switch
Use this switch to set the communications conditions for the K3SC to those used by connected devices.
Setting
Baud rate
1,200
bps
2,400
bps
4,800
bps
9,600
bps
Data length
19,200
bps
38,400
bps
7
8
Stop bits
2
1
Parity
Even
Odd
Configuration
None Master:
USB
ON↔OFF
Slave:
RS232C
1
ON
OFF
ON
OFF
ON
OFF
2
OFF
ON
ON
OFF
OFF
ON
3
OFF
OFF
OFF
OFF
ON
ON
OFF
4
Master:
RS-232C
or USB
(See note.)
Echoback
OFF
(without)
ON
(with)
Slave: Slave:
RSRS485
422
ON
OFF
5
ON
6
OFF
ON
OFF
7
OFF
OFF
ON
ON
8
OFF
OFF
9
ON
OFF
0
ON
Note: 1. All pins are factory-set to OFF.
2. When using RS-422 full-duplex communications, turn OFF pin 0.
3. When using the communications configuration with RS-232C or USB set for the master device and RS-422 or RS-485 set for the slave
device, use either RS-232C or USB (but not both) on the master device side.
Nomenclature
Terminal Cover
K3SC without Terminal Cover
Communications Status Indicators
Light (yellow) during communications.
• RS-232C/USB ↔ RS-422/485:
RD: Lights when receiving RS-422/485 communications.
SD: Lights when sending RS-422/485 communications.
• USB ↔ RS-232C:
RD: Lights when receiving RS-232C communications.
SD: Lights when sending RS-232C communications.
Power Indicator
Lights (green) when
power is supplied.
Communications Setting Switch
Used to set the communications conditions for
connected devices.
USB Port
Port for USB connections. Use this port
if the master device is a USB device.
Communications Setting Switch
Note: Cover the terminals to prevent electric shock.
Caution: Be sure to use the K3SC-10 with
the terminal cover mounted
when using in machinery that
must conform to EN/IEC standards.
Switch
1
2
3
4
5
6
7
8
9
10
Setting
Baud rate
M3.5 Terminal Screw
Data length
Parity
Master device
Slave device
Echoback
6
K3SC
Dimensions
K3SC-10
7
Mounting Hole Dimensions
(For Direct Mounting)
Two, M4 or 4.3-dia. holes
75
80
30
3
23.5
51.5
78
72±0.3
Note: DIN track mounting is also possible.
7
K3SC
Safety Precautions
!CAUTION
Do not touch any of the terminals while power is being
supplied. Doing so may result in electric shock.
Do not allow metal objects or wire cuttings to enter the
product. Doing so may result in electric shock, fire, or
malfunction.
Do not attempt to disassemble, repair, or modify the
product. Any attempt to do so may result in malfunction,
fire, or electric shock.
Make sure that the power supply voltage is within the
specified range. Otherwise, damage or burning may
result.
Be sure to tighten the terminal screws to the specified
torque. Loose screws may result in burning or
malfunction. The recommended tightening torque is
0.78 N·m.
■ General Precautions
• Do not mount the product in the following places:
1. Locations subject to shock or vibration
2. Outdoor locations or locations subject to direct sunlight, wind, or
rain.
3. Locations subject to temperatures or humidity outside the
specified ranges
4. Locations subject to condensation or icing
5. Locations subject to large amounts of dust
6. Locations subject to flammable gases or objects
7. Locations subject to corrosive gases (in particular sulfide or
ammonia gases)
• Be sure to check power supply specifications, terminal numbers,
and polarities before performing wiring.
• Turn OFF the power supply before performing installation or wiring.
• Turn OFF the power supply before removing the terminal cover.
Accidentally touching the terminals may result in electric shock.
• Do not connect anything to unused terminals.
■ Correct Use
• Perform wiring with crimp terminals that are suitable for M3.5
screws.
• Install the product as far away as possible from devices that
generate strong high-frequency noise (e.g., high-frequency
welders) or surges.
• Do not pull on the USB cable. Doing so may cause the cable to
come loose.
• Almost all application programs run with the K3SC driver, which
provides a virtual communications port for USB communications.
Some application programs do not run, because this driver does
not support all of the API functions.
• The K3SC-10 is not simply a voltage level converter.
Communications data is converted by a built-in CPU. Depending on
communications conditions, processing may not be able to keep up
with communications, and occasionally data corruption or data
omissions may occur. If necessary, reduce the baud rate or the
frequency of communications, or take other suitable
countermeasures.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
In the interest of product improvement, specifications are subject to change without notice.
8
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016.4
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2016 All Right Reserved.
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