| DB9 male | |
| 1 | Voltage metering |
| 2 | NC |
| 3 | Power input |
| 4 | Interlock |
| 5 | Voltage programming + |
| 6 | Signal return |
| 7 | Power return |
| 8 | Power return |
| 9 | Voltage programming - |
| DB9 female | |
| 1 | Interlock |
| 2 | Power return |
| 3 | NC |
| 4 | Case ground |
| 5 | -8 NC |
| 9 | Signal ground |
| Model 2591P | Qty 1. $1,162 | Qty2-9. $1,056 |