Typical RS-232 wiring from PC to CNC
Typical RS-232 wiring from PC to CNC
Please note! "Standard RS-232" straight through wired, pre-made cables will
not work unless you add a Null-Modem
adapter or buy a Null-modem cable where pin 20 is connected to both pins 6 and 8
on the other end.
The following diagram depicts the cable wiring between a DNC workstation’s communications port (either the standard built-in COM1 and COM 2 or RocketPort expansion ports) and most CNC’s. The numbers given are for standard 25 pin D-subminiature RS-232 connectors. On the PC side of the cable the connector must be a socket. On the CNC side it varies. FANUC and Yasnac’s, for example require plugs. Okuma’s and Cincinatti’s generally require sockets.
This wiring assumes the following for 25 pin D-sub connectors:
At the PC and the CNC pins 2 and 4 are outputs. Pins 3 and 5 are inputs. Pin 7 is logic ground.
PC (9 Pin) or (25 Pin socket) CNC (25 Pin-as required)
- - X------------------------------------------------------------- 1 shield
3 2------------------------------------------------------------- 3 RXD
2
3------------------------------------------------------------- 2 TXD7 4------------------------------------------------------------- 5 CTS
8
5------------------------------------------------------------- 4 RTS
5 7------------------------------------------------------------- 7 GND
6
8
20
Connect the shield drain wire to pin 1 at the CNC end of the cable only.
