Serial Pin-outs
RS-232 over DE-9
|
Female 5 4 3 2 1 9 8 7 6 |
Male 1 2 3 4 5 6 7 8 9 |
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Serial ports on common PC hardware have this pin-out.
RS-232 over DB-25
|
Female 13 12 11 10 09 08 07 06 05 04 03 02 01 25 24 23 22 21 20 19 18 17 16 15 14 |
Male 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 |
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
12 SDCD
13 SCTS
14 STXD
15 TCLK
16 SRXD
17 RCLK
18 LL
19 SRTS
20 DTR
21 RL/SQ
22 RI
23 CH/CI
24 ACLK
The VT 320 has this pinout.
RS-232 over 8P8C, Sun
|
Top of plug 1 2 3 4 5 6 7 8 |
1 RTS
2 DTR
3 TXD
4 GND
5 GND
6 RXD
7 DSR
8 CTS
The Sun Netra, ascorbic-acid, has this pinout.
Black DE-9 Female to 8P8C Adapter
| DE-9 | 8P8C |
| 1 | 6 |
| 2 | 1 |
| 3 | 5 |
| 4 | 4 |
| 5 | 2 |
| 6 | 3 |
| 7 | 7 |
| 8 | 8 |
The black adapter has this pinout.
Grey DB-25 female to 8P8C Adapter
| DB-25 | 8P8C |
| 2 | 3 |
| 3 | 4 |
| 4 | 8 |
| 5 | 1 |
| 6 | 7 |
| 7 | 5 |
| 7 | 6 |
| 8 | 7 |
| 20 | 2 |
Grey DB-25 Male to 8P8C Adapter
| DB-25 | 8P8C |
| 2 | 6 |
| 3 | 8 |
| 4 | 5 |
| 5 | 4 |
| 6 | 1 |
| 7 | 3 |
| 7 | 7 |
| 20 | 2 |
Dumbterm Cable
| DE-9 | 8P8C | 8P8C | DB-25 | |
| DCD | 1 | 6 | 7 | 8 |
| RXD | 2 | 1 | 4 | 3 |
| TXD | 3 | 5 | 3 | 2 |
| DTR | 4 | 4 | 2 | 20 |
| GND | 5 | 2 | 5 | 7 |
| DSR | 6 | 3 | X | 6 |
| RTS | 7 | 7 | 8 | 4 |
| CTS | 8 | 8 | 1 | 5 |
| DE-9 end | DB-25 end | |
| 1 | Gr/W | Br |
| 2 | Gr | Bl |
| 3 | Or/W | Bl/W |
| 4 | Bl | Gr/W |
| 5 | Bl/W | Gr |
| 6 | Or | X |
| 7 | Br/W | Or |
| 8 | Br | Br/W |
This cable is used to connect a DB-25 DTE port to a DE-9 DTE port using some non-standard adapters.
Almost Rollover Cable
| 8P8C | 8P8C |
| 1 | 8 |
| 2 | 7 |
| 3 | 6 |
| 4 | 4 |
| 5 | 5 |
| 6 | 3 |
| 7 | 2 |
| 8 | 1 |
This cable uses the Sun pinout, with a minor modification: the two GND wires are connected straight through. With DE-9<->8P8C modular jacks, you cannot connect the DE-9 GND to both GND pins of the 8P8C end (i.e., you can't stick two pins in one hole). Connecting using a standard rollover is fine when connecting e.g. the Netra to a DE-9, but if two DE-9s are connected via a standard rollover, GND will be an open circuit. The "almost" rollover connects the two GND lines straight through to avoid this problem. The module jacks we have now use 8P8C pin 4 for GND.
The two cables we have with this pinout are labeled "Serial 87645321".
Half-Cables
Light Serial Mouse
2 green
3 brown
4 pink
5 yellow
7 white
Dark Serial Mouse
2 white
3 light brown
4 brown
5 black
7 blue
Metal End
2 green
3 yellow
5 black
6 red
7 brown
8 white