4
External Interfaces
• This ST unit’s serial interface is not isolated.When the host (PLC) unit is also not iso-
lated, and to reduce the risk of damaging the RS232C/RS422/RS485 circuit, be sure
to connect pin #5 SG (Signal Ground) terminal.
• Similarly shaped connectors are used for COM1 and COM2 of the ST. Therefore, be
sure to connect the correct connectors. Communication is not available unless the
connectors are connected correctly.
• When isolation is necessary, you can use the RS232C isolation unit (CA3-ISO232-01) on
COM1.
COM1
Recommended Cable Connector XM2D-0901 <made by OMRON Corp.>
Recommended Jack Screw
XM2Z-0073 <made by OMRON Corp.>
Recommended Cable Cover
XM2S-0913 <made by OMRON Corp.>
Interfit Bracket
#4-40 inch screws are used.
Pin #
RS232C
Signal Name
Meaning
1
CD
Carrier Detect
2
RD(RXD)
Receive Data
3
SD(TXD)
Send Data
4
ER(DTR)
Data Terminal Ready
5
SG
Signal Ground
6
DR(DSR)
Data Set Ready
7
RS(RTS)
Request to Send
8
CS(CTS)
Clear to Send
9
CI(RI)/VCC
Called status display/
+5V±5% Output 0.25A
*1
*1 The RI/VCC selection for Pin #9 is switched via software. The VCC output is not protected against
overcurrent. To prevent damage or unit malfunctions, use only the rated current.
Shell
FG
Frame Ground
(Common with SG)
