775-336-4000
Loopback Diagrams
Serial and Parallel Port external loopback wiring diagrams.
Serial Port
The Serial Port external loopback testing requires a loopback plug. The connections for D25 and D9 serial ports are shown here.
Signals |
Pins D25 |
Pins D9 |
Example |
|---|---|---|---|
| RX/TX | 2, 3 | 2, 3 |  |
| RTS/CTS | 4, 5 | 7, 8 | |
| DSR/DTR/CD | 6, 8, 20 | 1, 4, 6 | |
Parallel Port
The Parallel Port external loopback testing requires a D25 parallel port loopback plug wired as show here.
Signals |
Pins D25 |
Example | |
|---|---|---|---|
| Stobe/Select In | 1, 13 |  |
|
| Data0/Error In | 2, 15 | ||
| Auto FD/Paper End In | 12, 14 | ||
| Init/Acknowledge In/CD | 10, 16 | ||
| Select Out/Busy In | 11, 17 | ||
