Avalue EMS-BYT - Manual (Page 15)

Quick Reference Guide
EMS-BYT Series Quick Reference Guide 15
2.1 EMS-BYT connector mapping
2.1.1 External Serial Port 1 connector (COM1)
Pin RS-232 RS-485 RS-422
1 DCD TXD-/RXD- TXD-
2 RXD TXD+/RXD+ TXD+
3 TXD RXD+
4 DTR RXD-
5 GND GND GND
6 DSR
7 RTS
8 CTS
9 RI
2.1.2 External Serial Port 3/4/5/6 connector (COM3/4/5/6)
Pin RS-232 RS-485 RS-422
1 DCD TXD-/RXD- TXD-
2 RXD TXD+/RXD+ TXD+
3 TXD RXD+
4 DTR RXD-
5 GND GND GND
6 DSR
7 RTS
8 CTS
9 RI