Schneider Electric Modicon BM85 - Manual (Page 96)

Compatible Devices and Cables 86 86
890 USE 103 00
A.2 Modbus/RS232 Cable Wiring Diagrams
W952
W953 W978
CABLE APPLICATION
W978
W952
W953
MODEM
IBM AT
P230, DEC VT100, IBM XT
Figure 25 Modbus/RS232 Cable Wiring Diagrams