38
CMA34CR cpuModule
BDM-610000083
Rev L
RS-232 Serial Port (Default)
The default serial port mode is full-duplex RS-232. With this mode enabled, the serial port connectors must be
connected to RS-232 compatible devices. Table 19 provides the serial port connector pinout and shows how to
connect to an external DB-25 or DB-9 compatible serial connector.
Table 19
Serial Port in RS-232 Mode
Pin
Signal
Function
In/Out
DB-25
DB-9
1
DCD
Data Carrier Detect
in
8
1
2
DSR
Data Set Ready
in
6
6
3
RXD
Receive Data
in
3
2
4
RTS
Request To Send
out
4
7
5
TXD
Transmit Data
out
2
3
6
CTS
Clear To Send
in
5
8
7
DTR
Data Terminal Ready
out
20
4
8
RI
Ring Indicate
in
22
9
9,10
GND
Signal Ground
—
7
5
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