Inputs / outputs on House Commander can be expanded using standard GX0505 / GX1000 IO expanders. These need to be mounted in a separate enclosure.
| Code | Description |
| GC0321-RTM-HC | GC0321-Based House Commander. Basic model (Plastic version) |
| GC0641-RTM-HC | GC0641-Based House Commander. Advanced model (Plastic version) |
| GC0321-RTMS | GC0321-Based House Commander. Basic model (Metal enclosure version) |
| GC0641-RTMS | GC0641-Based House Commander. Advanced model (Metal Enclosure version) |