How many zones does the GD-48 support, and can it be expanded?
The GD-48 comes with 16 on-board zones and can be expanded up to a maximum of 48 zones. It also supports up to 32 inclusive wireless zones. The system can be divided into up to 8 independent groups (areas). (Page 6)
From the official Honeywell GD-48 Security System Control Panel manual, page 6
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