B&B Electronics RS-232/422/485 Serial Card CE 3PXCC4A - Manual (Page 42)

40 Manual Document# 3PXCC4A3001
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
RS-422 Pinouts
RS-422 mode supports transmit and receive data signals.
The pinouts of the RJ45 connector are given in Table 6. Figure 5
shows how to connect a typical RS-422/RS-485 full duplex
communication link.
Table 6. RS-422/RS-485 Pinout Description
RS-485 Pinouts
RS-485 mode supports both full and half duplex
communications (transmit and receive data signals). The pinouts of
the DB-9 connector are given in Table 6 (if full duplex
communication is used). Figure 5 shows how to connect a typical
RS-422/RS-485 full duplex communication link. Figure 6 shows how
to connect a typical RS-485 half duplex communication link.
RJ45 Pin RS-422
signal
Direction MDB9
Pinout
MDB25
Pinout
1 TD(B) output 7 4
2 TD(A) output 3 2
3 RD(B) input 8 5
4 RD(A) input 2 3
5 NA NA 4 20
6 NA NA 6 6
7 NA NA 1 8
8 GND ---- 5 7