Pc Serial Port Pinouts - ZyXEL Communications U-336S User Manual

When they are closed, pins 1 and 2 will connect to pins 4 and 5 as
will pins 7 and 8 to pins 3 and 6. The result is an RJ-45 type signal
connection on the central four pins. Note that the other four pins
still have the same signals connected and thus do not conform to
RJ-45.

PC Serial Port Pinouts

Signal
Pin
ITU-TSS
Signal
Name
1 101
2 103
3 104
4 105
5 106
6 107
7 102
8 109
15 114
17 115
18 141
EIA Pin/Signal
Signal Description
Name
AA Protective Ground
(GND).
BA Transmitted
Data(TXD).
BB Received
Data(RXD).
CA Request To Send
(RTS).
CB Clear To Send
(CTS).
CC Data Set Ready
(DSR).
AB Signal Ground
(GND).
CF Data Carrier
Detected (DCD).
DB Transmit Clock
Signal (source:
DCE).
DD Synchronous
Receive Clock.
Local Analog
Direction
DTE-DCE
→
←
→
←
←
←
←
←
→
Connector Pinouts 143