36
CMX32M cpuModule
BDM-610000075
Rev B
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 20. The supported combinations of serial port modes are
listed in Table 21, which also includes a reference to the corresponding connector pinout.
Table 20
Dual Serial Port Connections
Connector
COM A
COM B
CN7
COM 1
COM 3
CN8
COM 2
COM 4
Table 21
Dual Serial Port Modes
COM A
COM B
Pinout
Reference
RS-232
RS-232
RS-422
RS-232
RS-422
RS-422
RS-485
RS-232
RS-485
RS-485
Table 22
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
Summary of Contents for BDM-610000075
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