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Pin
Signal
2
TxD
3
RxD
4
RTS
5
CTS
6
DSR
7
GND
20
DTR
8
DCD
For DTE to DCE connection, use straight through cable, i.e. you don't
have to reverse lines 2 and 3, lines 4 and 5, and lines 6 and 20.
Because in general the DCE RS-232 interfaces are reversed them-
selves.
Pin
Signal
2
TxD
3
RxD
4
RTS
5
CTS
7
GND
6
DSR —
20
DTR
8
DCD —
If not using CTS, RTS, DSR ,DTR signals, please loop back for the
PC-ComLIB software to function correctly, because PC-ComLIB will
always check for handshake signals.
Pin
2
3
4
5
6
7
20
8
Pin
3
2
—
—
7
—
Signal
RxD
TxD
CTS
RTS
DTR
GND
DSR
DCD
Signal
RxD
TxD
GND
Chapter 4 Wiring
27
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