- RTD Embedded Technologies switch User's Manual

BDM-610000049 Rev G Chapter 3: Connecting the cpuModule 41
Table 25 COM A (RS-422/485) and COM B (RS-232)
Pin Signal Function In/Out DB-9
1 DCD1 COM A - Data Carrier Detect in 1
2 RXD2 COM B - Receive Data in 6
3 RXD1- COM A - Receive Data (–) in 2
4 TXD1+ COM A - Transmit Data (+) out 7
5 TXD1- COM A - Transmit Data (–) out 3
6RXD1+COM A - Receive Data (+) in8
7 TXD2 COM B - Transmit Data out 4
8 RI1 COM A - Ring Indicate in 9
9,10 GND Signal Ground — 5
Table 26 COM A (RS-422/485) and COM B (RS-422/485)
Pin Signal Function In/Out DB-9
1 RXD2+ COM B - Receive Data (+) in 1
2 RXD2- COM B - Receive Data (–) in 6
3 RXD1- COM A - Receive Data (–) in 2
4 TXD1+ COM A - Transmit Data (+) out 7
5 TXD1- COM A - Transmit Data (–) out 3
6RXD1+COM A - Receive Data (+) in8
7 TXD2- COM B - Transmit Data (–) out 4
8 TXD2+ COM B - Transmit Data (+) out 9
9,10 GND Signal Ground — 5