Overview
Interlogix Simon self-contained wireless panels (Simon XT, XTi) combine a compact control board with built-in 319.5 MHz receiver for TX-E sensors and optional Alarm.com LTE communicators.
The panel is the brain of the intrusion system: it supervises wired and wireless zones, drives bell/siren outputs, manages automation on supported models, and reports to Alarm.com / UltraSync when a compatible communicator is installed. Installers program zones, user codes, and dialer options with dealer programming tools (varies by Challenger, Reliance, Simon); end users arm/disarm from RAS keypads, keyfobs, or the monitoring app.
At a Glance
| Specification | Details |
|---|---|
| Role | All-in-one wireless residential panel |
| Wireless | 319.5 MHz TX-E sensor family |
| Keypad | Integrated touch-button or touchscreen UI |
| Cellular | Add-on LTE module for Alarm.com / monitoring |
| Limits | Compact residential zone count — verify Simon capacity before expansion |
What This Panel Does Well
Coordinates intrusion zones, automation, user codes, and central station reporting when cell and monitoring are configured.
Before You Service or Replace One
- Exact panel model — Simon vs Challenger vs Reliance vs Tecom — firmware and modules differ.
- Encryption — TX-E vs hardwired vs Challenger wireless sensors in the field.
- Cell module SKU — Simon Alarm.com LTE vs Challenger/Tecom 4G (AU/NZ SKUs).
- Installer code — required for zone changes; document before service.
- Alarm.com / UltraSync dealer — account status, plan, and remote programming access.
Official Sources
- Aritech product page
- Alarm.com Dual-Path LTE Communicators for Interlogix Simon Panels - Install Guide
- Interlogix Simon XT - User Manual
- Interlogix Simon XT - User and Installation Errata
Use official Aritech install PDFs and install guides for exact wiring, enrollment, and firmware — specifications vary by SKU and region.
Troubleshooting
Quick diagnostic flow
- Confirm exact model/SKU on label matches official install guide.
- Clear panel AC and cell troubles before diagnosing wireless devices.
- Read zone trouble — tamper and low battery before "missing."
- Verify TX-E 319.5 MHz vs hardwired vs 433 MHz expander sensor matches panel hardware.
- For cell modules: ICCID, antenna, RSSI, and dealer platform match.
- Power-cycle panel only per dealer policy — document user codes first.
Symptom-based fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Zone missing | Range or battery | Replace battery; add 433 MHz expander or receiver placement |
| Encryption trouble | Wrong sensor series | Use TX-E on Simon or wired on Challenger DGP |
| Cell fail persists | SKU or activation | Correct LTE module; dealer activates Alarm.com / UltraSync |
| Z-Wave won't include | Prior hub pairing | Exclude from old controller; include near panel |
| Takeover false alarms | Wired loop fault | Check EOL wiring; verify burglary-only zones |
| Cannot arm | Open zone or trouble | Status screen — secure or bypass per policy |
Testing checklist
| Test | How | Pass criteria |
|---|---|---|
| Walk test | Installer walk test mode | Each sensor reports at panel |
| Arm Away | Keypad or Alarm.com / UltraSync | Exit delay; interior sensors active |
| Entry delay | Open entry door | Delay before alarm |
| Cell test | Installer comm test | Success; Alarm.com / UltraSync shows online |
| AC loss | Disconnect panel AC briefly | Battery support; trouble reports |
| Z-Wave device | Toggle from panel/Alarm.com / UltraSync | Device responds |
After replacement
Delete old zone, enroll new hardware, update zone name, run walk test, and notify monitoring dealer if central station records zone numbers.
Source: Interlogix Simon XT user and installation manual; Aritech official documentation.