B&B Electronics Port Expander 232PE - Manual (Page 10)

6 232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
RS-422/485 Option
The RS-232 transmit and receive data signals on the master
port of the 232XSS will be converted to balanced full-duplex RS-
422 or half-duplex RS-485 signals with this option.
Figure 4. Simplified RS-232 Schematic
Table 3. RS-422/485 PORTS A - D
Pin # Signal Description
RS-422/485
Signal Direction
of Ports A - D
2 TD(A) Transmit Data (A) Output
14 TD(B) Transmit Data (B) Output
7 SG Signal Ground <------>
3 RD(A) Receive Data (A) Input
16 RD(B) Receive Data (B) Input