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Overview
MX974 pet-immune PIR motion detector for MX wireless intrusion systems.
Product type
Security sensor
At a glance
| Detail | Value |
|---|---|
| Category | Security sensor |
| Primary manual | MX974 MX PIR with Pet Immune Installation Guide |
| Install scope | Premises panel or bus device |
| Supervision | Panel trouble display when faulted |
What this device does in the system
Reports intrusion, life-safety, or status conditions to the host panel — faults appear as zone or module troubles, not always on the device itself.
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 PowerG Wireless Digital Pet-Immune PIR Motion Detector (ID 2629)
- MX974 MX PIR with Pet Immune Installation Guide — DSC official documentation
Troubleshooting
Quick diagnostic flow
- Confirm model on label matches MX974 MX PIR with Pet Immune Installation Guide.
- 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 |
|---|---|---|
| Walk test | Panel walk test mode per manual | Zone activates and restores at panel |
| Wireless placement | Enroll-time placement test (IMPASSA [804], PowerG DLS) | Stable RF at mounted location |
| Tamper | Open cover | Tamper shows; restores on close |
| Battery | Simulate or wait for low-battery report | Supervision maintained after replacement |
After replacement
Re-enroll the device, re-test supervision, run walk test, and document serial/zone assignment for service handoff.
Source: MX974 MX PIR with Pet Immune Installation Guide; host system installation guide.
Installation Notes
Follow MX974 MX PIR with Pet Immune Installation Guide 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: MX974 MX PIR with Pet Immune Installation Guide (DSC official documentation).
FAQs
Which panels or systems does PowerG Wireless Digital Pet-Immune PIR Motion Detector work with?
See compatible-peripherals.md for the host compatibility table. Match bus type and wireless generation before ordering.
Why does the panel show a fault after install?
Usually enrollment, wiring, power, or tamper — read the active trouble on the panel ([*, 2] where supported) before replacing hardware.
Can I use this on a different brand panel?
Only if the install manual explicitly lists cross-brand compatibility — most DSC devices are family-specific.
Where is the official documentation?
DSC PowerG Wireless Digital Pet-Immune PIR Motion Detector (ID 2629) — MX974 MX PIR with Pet Immune Installation Guide
How do I test after installation?
Complete walk test, supervision test, and (for wireless) placement test at the final mounted location — bench tests miss range issues.
Why false alarms on motion or glass-break?
Check pet immunity setting, mounting height, masking tabs, and environmental sources (heaters, sunlight, vibrating glass).
How long do wireless batteries last?
Typical 3–5 years depending on model and traffic — replace with listed battery SKU only.
Can one sensor work on two partitions?
Usually one partition per zone — reprogram in panel software if dual-partition assignment is supported for your model.