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 Dual POTS Line Card For SYSTEM III (ID 1444)
- Sur-Gard Line Card Installation Manual — DSC official documentation
Troubleshooting
Quick diagnostic flow
- Confirm model on label matches Sur-Gard Line Card Installation Manual.
- Verify host system in compatible-peripherals.md.
- Read active panel trouble (
[*, 2]) — note zone vs module vs low battery. - Check power and supervision at the panel/receiver before replacing the device.
- For wireless: test signal and enrollment at install location.
- For wired: verify EOL, polarity, and zone type programming.
Symptom-based fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Trouble immediately after install | Not enrolled / wrong zone type | Re-enroll; match zone definition to device |
| Intermittent fault | Marginal RF or loose terminal | Secure wiring; relocate wireless; check bus voltage |
| Works in test, fails in service | Placement or environmental | Final-mount placement test; adjust sensitivity |
| No alarm response | Programming / partition | Output mapping, partition assignment, bell enable |
Testing checklist
| Test | How | Pass criteria |
|---|---|---|
| Supervision | Disconnect module briefly | Panel trouble within supervision window |
| Functional | Activate mapped output/zone | Expected panel response |
| Load | Measure AUX under full load | Voltage within manual range |
After replacement
Re-enroll the device, re-test supervision, run walk test, and document serial/zone assignment for service handoff.
Source: Sur-Gard Line Card Installation Manual; host system installation guide.