rtd cpuModules CME34BT, User Manual, Page: 48 / 110

40 CME34BT cpuModule BDM-610000088 Rev A
RS-422 Mode Pinout
Table 14 provides the serial port connector pinout when RS-422 mode is enabled.
Facing the serial port connector, the pinout is:
Table 14 Serial Port in RS-422 Mode
Pin Signal Function In/Out DB-9
1 TXD– Transmit Data (–) out 1
2 — Reserved — 6
3 TXD+ Transmit Data (+) out 2
4 — Reserved — 7
5 RXD+ Receive Data (+) in 3
6 — Reserved — 8
7 RXD– Receive Data (–) in 4
8 — Reserved — 9
9 GND Signal Ground — 5
10 GND Signal Ground — —
9 7 5 3 1
GND RXD- RXD+ TXD+ TXD-
GND Rsvd Rsvd Rsvd Rsvd
10 8 6 4 2
WARNING The pinout of the COM ports in RS-422 mode is not compatible with previous
generations of RTD cpuModules.