Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 78 / 478

2 Initial Settings and Allocations of Device Variable for CJ-series Unit
2-4
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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RS-232C Ports
* The maximum cable length for RS-232C is 15 m. The RS-232C standard, however, does not cover baud rates
above 19.2 Kbps. Refer to the manual for the device to be connected to confirm support.
Connector Pin Layout
*1 Pin No. 1 and the shell are connected to the ground terminal (GR) of the Power Supply Unit inside of the Serial
Communications Unit. Therefore, ground the GR of the Power Supply Unit to ground the cable shield.
*2 You can monitor the status of the RS, CS, DR, and ER signals by using the device variables for CJ-series Unit.
For details, refer to 2-3-4 Device Variable for CJ-series Unit for Status. You can use the DR signal for any pur-
pose specified by the user since it does not affect the system operations.
*3 Pin 6 (5 V) is required when the NT-AL001 Link Adapter is connected. For details on connection methods, refer
to 3-2 Wiring.
*4 The DR signal is used to monitor the signal cable. You can also use it as a CD (carrier detection) signal.
Protocol Protocol macro
Communications
method Full-duplex or half-duplex
Synchronization Start-stop synchronization (asynchronous)
Baud rate
1200/2400/4800/9600/19200/38400/57600/
115200/230400 bps
Connections 1:1 (1:N is possible with Link Adapters)
Transmission
distance 15 m max. (*)
Interface Complies with EIA RS-232C
Protocol
No-proto-
col
Serial Gateway Modbus-RTU
Communications
method Full-duplex --- ---
Synchronous mode --- --- ---
Baud rate 1200/2400/4800/9600/19200/38400/57600/115200/230400 bps
Connection
configuration 1:1 (1:N is possible with Link Adapters)
Communications
distance 15 m max. (*)
Interface Complies with EIA RS-232C
Pin No.
Abbrevia-
tion
Signal name I/O
1 (*1) FG Shield ---
2 SD Send data Output
3 RD Receive data Input
4 (*2) RS Request to send Output
5 (*2) CS Clear to send Input
6 (*3) 5V Power supply ---
7 (*2) DR Data set ready (*4) Input
8 (*2) ER Data terminal ready Output
9 SG Signal ground ---
Shell (*1) FG Shield ---
9
5
1
6