32
Pin Number
Name
Function / Description
Direction
1
CD
+5v
(through a 10K ohm pull-up resistor)
output
2
TXD
Transmit Data
output
3
RXD
Receive Data
input
4
DTR
Internally connected to DSR, pin #6
5
Sig. Gnd.
Isolated from vehicle ground
---
6
DSR
Internally connected to DTR, pin #4
7
CTS
Clear To Send
input
8
RTS
Ready To Send
output
9
RI
not used
Table 7 P4 Pin Descriptions, RS-232
Pin Number
Name
Function / Description
Direction
1
GND
Isolated ground
2
CTS+
Clear To Send
input
3
CTS-
Clear To Send
input
4
RXD+
Receive Data
input
5
RXD-
Receive Data
input
6
RTS-
Ready To Send
output
7
RTS+
Ready To Send
output
8
TXD+
Transmit Data
output
9
TXD-
Transmit Data
output
Table 8 P4 Pin Descriptions, RS-422
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