IEI Integration UPC-12AH_GM45 v1.00 - Manual (Page 59)

UPC-12A/GM45 Panel PC
Page 47
Figure 4-14: COM4 Function Select Jumper Locations
4.10.5.1 COM4 RS-422 and RS-485 Pinouts
The pinouts for RS-422 and RS-485 operation of external serial port COM 4 are detailed
below.
COM 4 RS-422 Description
Pin 1 TX-
Pin 2 TX+
Pin 6 RX-
Pin 7 RX+
Table 4-7: RS-422 Pinouts
COM 4 RS-485 Description
Pin 1 Data-
Pin 2 Data+
Table 4-8: RS-485 Pinouts