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40 CMX158886 cpuModule BDM-610000049 Rev G
Dual Serial Port Modes
The serial port connectors can be configured as dual serial ports in the BIOS. The mapping between the
connectors and COM port numbers is shown in Table 22. The supported combinations of serial port modes are
listed in Table 23, which also includes a reference to the corresponding connector pinout. For the configurations
that have RS-422 or RS-485 on COM B, a jumper must be installed.
Table 22 Dual Serial Port Connections
Connector COM A COM B
CN7 COM 1 COM 3
CN8 COM 2 COM 4
Table 23 Dual Serial Port Modes
COM A COM B Pinout
Reference
JP12/JP14
RS-232 RS-232 Table24 Not Installed
RS-422 RS-232 Table25 Not Installed
RS-422 RS-422 Table26 CN7: JP12
CN8: JP14
RS-485 RS-232 Table25 Not Installed
RS-485 RS-485 Table26 CN7: JP12
CN8: JP14
Table 24 COM A (RS-232) 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 RTS1 COM A - Request To Send out 7
5 TXD1 COM A - Transmit Data out 3
6 CTS1 COM A - Clear To Send in 8
7 TXD2 COM B - Transmit Data out 4
8 RI1 COM A - Ring Indicate in 9
9,10 GND Signal Ground — 5