GV2 with firmware version 7.08 and higher, GV3 and GV4 panel types have the ability to manually turn onboard relays On or Off using the Command 54 operation. Select onboard relay A, B or C by entering the relay number as described below:
| On-Board Relay | Relay Number | Mapped Relay Number* |
| A (terminal 6) | 253 | 250 |
| B (terminal 7) | 254 | 251 |
| C (terminal 😎 | 255 | 252 |
The error tone will sound when a relay number outside the available range of relays is entered. Only GV2 ver 7.08+, GV3 and GV4 panel types allow selecting relays 253, 254 or 255. The available relays using expansion are listed below:
- D7212/G/GV2/GV3/GV4: Relays 1-24
- D7412/G/GV2/GV3/GV4: Relays 1-64
- D9412/G/GV2/GV3/GV4: Relays 1-128
