Dual serial port modes – IBM BDM-610000049 User Manual
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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
Not Installed
RS-422
RS-232
Not Installed
RS-422
RS-422
CN7: JP12
CN8: JP14
RS-485
RS-232
Not Installed
RS-485
RS-485
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