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1.4.2.
RS232 Dsub Connector
A serial port connector is interfaced through the 9pin Dsub male connector. For
specifications of each pin, see the following:
No. Name
Description
Signal Level Direction
Remark
1
NC
2
RXD
Receive Data
RS232
Input
mandatory
3
TXD
Transmit Data
RS232
Output
mandatory
4
DTR Data Terminal Ready
RS232
Output
Always ON
5
GND
Ground
Ground
-
mandatory
6
DSR
Data Set Ready
RS232
Input
Not used
7
RTS
Request To Send
RS232
Output
optional
8
CTS
Clear To Send
RS232
Input
optional
9
NC
