Serial Communication Adapters
Instruction Manual
8
Figure 1. RS-422 or RS-485 Wiring
Notes:
1.
Termination resistors are optional and values depend on the cable length and charac-
teristic impedance. Consult the cable manufacturer for recommendations.
2.
Use shielded cable, twisted-pairs plus ground. Connect ground shield only at one
location.
Figure 2. RS-485 Two-Wire Multi-Drop Wiring
Notes:
1.
Termination resistors are optional and values depend on the cable length and charac-
teristic impedance. Consult the cable manufacturer for recommendations.
2.
Use shielded cable, twisted-pair plus ground. Connect ground shield only at one loca-
tion.
