Shapes Of Com Ports - Pro-face GP-577R Series Replacement Manualbook

4.2 Shapes of COM ports

D-Sub 25 pin (socket)
COM1
COM2
NOTE
For the COM ports of GP-577RT/S and GP-4501T/TW, the pin assignment and the
shape of plug/socket connector are different. Because of it, the existing PLC
connection cables cannot be used as they are. If you use the existing connection
cables, see [4.5 Cable Diagram at the time of
GP-577RT/S
RS-232C/422
-
38/48
GP-4501T/TW
D-Sub 9 pin (plug)
RS-232C
D-Sub 9 pin (plug)
RS-422/485
replacemet].