Overview
Sur-Gard SYSTEM III/IV POTS, dual-POTS, and network line cards expand central-station receiver capacity.
Product type
Module / accessory
At a glance
| Detail | Value |
|---|---|
| Category | Module / accessory |
| Primary manual | Sur-Gard Line Card Installation Manual |
| Install scope | Central station / infrastructure |
| Supervision | Central-station receiver |
What this device does in the system
Extends panel capacity (zones, outputs, wireless, power, or reporting) — plan bus address, current draw, and device limits before install.
Before you install or replace one
- Confirm exact model number on the label matches the install manual.
- Verify host panel or system family — Keybus, Corbus, Combus, PowerG, MX, or 433 MHz are not interchangeable.
- Check device limits on the panel/receiver before adding zones, sirens, or credentials.
- Include current draw in power budget calculations for modules, receivers, and keypads.
- For wireless: test RF at the mounted location, not only on the bench.
Official sources
- Product page: DSC Network Line Card For SYSTEM III (ID 144)
- Sur-Gard Line Card Installation Manual — DSC official documentation
Installation Notes
Follow Sur-Gard Line Card Installation Manual for mounting, wiring, addressing, and enrollment.
Pre-install checklist
- Match SKU to host system family and region (NA/EU frequency suffixes).
- Plan mounting location (wireless: signal; PIR: coverage; sirens: audibility; modules: bus homerun).
- Reserve panel zone/device slots and power budget.
- Confirm monitoring account accepts device type (fire/CO devices: fire account where required).
- Have installer code and DLS access ready for enrollment-heavy platforms.
Typical install sequence
- Mount device or module per manual clearances and height tables.
- Wire loop, bus, or enroll wireless ID as applicable.
- Program zone type, partition, siren delay, and device options in panel software.
- Run placement test (wireless) or megohm/loop test (wired) before closing cover.
- Walk-test sensor/siren or verify module output/supervision.
- Document location and zone/device number for end-user and central station.
Wiring reminders (wired devices)
| Loop type | Typical EOL | Notes |
|---|---|---|
| Normally closed burglary | 5.6 kΩ single EOL | Match panel zone definition |
| 2-wire smoke | per manual | Often dedicated PGM or zone type |
| Combus/Keybus module | bus homerun | Do not T-tap; observe polarity |
Source: Sur-Gard Line Card Installation Manual (DSC official documentation).