These devices allow you to expand the number of inputs / outputs on any GC-series GSM Commander and are available in different Input / output combinations. Outputs are 8Amp relays (as are found on the base unit). Inputs are each optically isolated (Except on GX1000DCL) . The expansion units interface to the GSM Commander base unit by means of a 10way ribbon cable, supplied with the device. Expansion units can be daisy-chained, using the IN and OUT ports on the device. (Except serial expansion units - GXSA008)
| Code | Description |
| GX0505-BOX | Expansion unit with interface cable : 5 x Opto-isolated Inputs / 5 x 8A Relay Outputs |
| GX1000-BOX | Expansion unit with interface cable : 10 x Opto-isolated Inputs |
| GX1000DCL-BOX | Expansion unit (Low power version) with interface cable : 10 x Dry Contact Inputs |
| GXSA008-BOX | Serial Expansion unit (Connects to GSM Commander Serial port) : 8 x 4-20mA inputs |
