Specifications for Serial Loopback plug
| Product Code | PM012 |
|---|
The serial port on IBM compatible PC's conform to the RS232 electrical standard and use a male DB-9 connector. (older PC's may use a DB-25). The DB-9 connector as the following 9 pins.
If you don't want to make your own plugs, you can always purchase our serial and parallel loopback plugs.
| DB-9 Pin | EIA abbreviation | Description |
|---|---|---|
| 1 | DCD | Data carrier detect |
| 2 | RXD | Receive data |
| 3 | TXD | Transmit data |
| 4 | DTR | Data terminal ready |
| 5 | GND | Signal ground |
| 6 | DSR | Data set ready |
| 7 | RTS | Request to send |
| 8 | CTS | Clear to send |
| 9 | RI | Ring Indicator |
To make the loop back plug the following pins need to be connected together
- Receive and transmit (2 & 3)
- Request to send and Clear to send (7 & 8)
- Data carrier detect, Data set ready and Data terminal ready (1, 6 & 4)
This diagram shows the pinout connections that need to be made. It's the rear view of the female DB-9 connector that's required for the plug. The red lines and gray dots show the connections that need to be made.
Specifications for Parallel Loopback plug
| Product Code | PM013 |
|---|
The parallel port on IBM compatible PC's have always used a DB-25 connector. However, over time several changes have taken place to the electrical interface with the introduction of enhanced and bi-directional parallel ports. We believe that this plug will work with all styles of parallel ports.
| DB-25 Pin | Direction | Description |
|---|---|---|
| 2 | Out | Data bit 0 (Least significant bit) |
| 3 | Out | Data bit 1 |
| 4 | Out | Data bit 2 |
| 5 | Out | Data bit 3 |
| 6 | Out | Data bit 4 |
| 10 | In | Acknowledge status |
| 11 | In | Busy status |
| 12 | In | Paper out status |
| 13 | In | Select status |
| 15 | In | Error status |
To make the loop back plug the following pins need to be connected together
- Data 0 and Error status (Pin 2 & 15)
- Data 1 and Select status (3 & 13)
- Data 2 and Paper out status (4 & 12)
- Data 3 and Acknowledge status (5 & 10)
- Data 4 and Busy status (6 & 11)
This diagram shows the connections that need to be made. It's the rear view of the male DB-25 connector that's required for the plug. The red lines and gray dots show the connections that need to be made.
Cabling
No cabling is required as these plugs are designed to connect directly to the back of a PC. If a cable is used, then it should be a straight through cable.
Compatibility
Window 98, ME, 2000, 2003, XP (32-bit and 64-bit), Vista (32-bit and 64-bit), 2008 Server (32-bit and 64-bit), Windows 7 (32-bit and 64-bit), Windows 8 (32-bit and 64-bit), Windows 10 (64-bit), Windows 11 (64-bit) and Linux platforms are supported, provided you have the correct version of BurnInTest.
In order to use the plugs with Windows, BurnInTest Professional v2.0 or above is required. For Linux, BurnInTest for Linux v1.0 or above is required.
As there are several ways to build loopback plugs, we can not guarantee the compatibility of our plugs with any software except BurnInTest Professional.
Compliance
See compliance page