5
External Interfaces
• For instructions on how to connect to other devices, always refer to the “GP-Pro EX
Device/PLC Connection Manual”.
• Always connect the #5 SG (Signal Ground) of the GP unit to the connected device,
especially if the connected device is also not isolated. Failure to do so may damage
the RS232C/RS422/RS485 circuit.
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.>
Fitting fastener
#4-40 (UNC)
Pin #
RS232C
RS422/RS485
Signal Name
Meaning
Signal Name
Meaning
1
CD
Carrier Detect
RDA
Receive Data A(+)
2
RD(RXD)
Receive Data
RDB
Receive Data B(-)
3
SD(TXD)
Send Data
SDA
Send Data A(+)
4
ER(DTR)
Data Terminal Ready
ERA
Data Terminal Ready A(+)
5
SG
Signal Ground
SG
Signal Ground
6
DR(DSR)
Data Set Ready
CSB
Clear to Send B(-)
7
RS(RTS)
Request to Send
SDB
Send Data B(-)
8
CS(CTS)
Clear to Send
CSA
Clear to Send A(+)
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.
ERB
Data Terminal Ready B(-)
Shell
FG
Frame Ground
(Common with SG)
FG
Frame Ground
(Common with SG)
