Serial printer connector pinout and signals. DB25
 |
DB25 pin D-SUB male (at the printer) |
| Pin |
Name |
Direction |
Description |
| 1 |
SHIELD |
|
Shield Ground |
| 2 |
TXD |
→ |
Transmit Data |
| 3 |
RXD |
← |
Receive Data |
| 4 |
n/c |
- |
Not connected |
| 5 |
n/c |
- |
Not connected |
| 6 |
DSR |
← |
Data Set Ready |
| 7 |
GND |
|
System Ground |
| 8 |
DCD |
← |
Data Carrier Detect |
| 9 |
n/c |
- |
Not connected |
| 10 |
n/c |
- |
Not connected |
| 11 |
? |
→ |
Reverse Channel |
| 12 |
n/c |
- |
Not connected |
| 13 |
n/c |
- |
Not connected |
| 14 |
n/c |
- |
Not connected |
| 15 |
n/c |
- |
Not connected |
| 16 |
n/c |
- |
Not connected |
| 17 |
TTY-TXD |
→ |
TTY Receive Data |
| 18 |
n/c |
- |
Not connected |
| 19 |
n/c |
- |
Not connected |
| 20 |
DTR |
→ |
Data Terminal Ready |
| 21 |
n/c |
- |
Not connected |
| 22 |
n/c |
- |
Not connected |
| 23 |
? |
→ |
TTY Receive Data Return |
| 24 |
? |
← |
TTY Transmit Data Return |
| 25 |
TTY-RXD |
← |
TTY Receive Data |