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Serial port pinouts
Posted March 23, 2005

Pin assignments for DB9 and DB25 serial ports.
 
Signal
RTS
DTR
TXD
G/SG
G/FG
RXD
DSR
CTS
DCD
RI
 
RJ45
1
2
3
4
5
6
7
8
 
DB9
7
4
3
5

2
6
8
1
9
"terminal"
DB9
7
4
3
5

2
6
8
1
 
DB25
4
20
2
7
1
3
6
5
8
22
"terminal"
DB25
4
20
2
7
7
3
6
5


CAB-500DTF
29-0810-01
"modem"
DB25
5
8
3
7

2
20
4
"TM-T88III"
DB25
5
6
3
7

2
20
4
DB25
null modem
5
6,8
3
7
1
2
20
4
20
"rollover"
RJ45
8
7
6
5
4
3
2
1

"modem" + straight cable + "terminal"
= null modem cable with modem's DCD showing up as DSR at terminal

"modem" + rollover cable + "terminal"
= regular serial cable with modem's DCD showing up as DSR at terminal

"TM-T88III" + straight cable + "terminal"
= Epson TM-T88III printer serial port to PC serial port
(like a null modem cable, but without messing with DCD)