Add description, images, menus and links to your mega menu
A column with no settings can be used as a spacer
Link to your collections, sales and even external links
Add up to five columns
Add description, images, menus and links to your mega menu
A column with no settings can be used as a spacer
Link to your collections, sales and even external links
Add up to five columns
August 31, 2026 9 min read
Installation instructions for the Napco StarLink SLe-GSM and SLe-GSM-3/4G GSM Alarm Communicators, fully supervised cellular backup/primary reporting units for GEM control panels.
Installation instructions for the Napco StarLink™ SLe-GSM and SLe-GSM-3/4G Series GSM Alarm Communicators — fully supervised, wireless digital two-way subscriber units that report alarm signals to any central station over a cellular network, for use as primary or backup communicators with GEM control panels.
The StarLink SLe-GSM and SLe-GSM-3/4G are fully supervised, wireless digital two-way subscriber units supported by an extensive nationwide wireless network:
Both models work with virtually any alarm control panel and can function as a backup to existing telephone lines, or as a primary communicator when telephone lines are absent (connected directly to the control panel Telco terminals). As a backup, both units automatically switch the communication channel from telephone line to network when telephone line trouble is detected. Enclosure tamper protection is provided on both models.
The units use proprietary data-capture technology to capture the alarm report from the control panel and transmit alarm signals to the SLe Control Center, which forwards them to any Central Station via standard receiver formats 4/2 and Contact ID. The SLe Control Center also generates a Supervisory signal if the network doesn't receive the expected supervisory test signal during a pre-scheduled period. Alarm signals transmit on the RF data-only portion of the GSM digital network for a fast, dependable communication path.
| Spec | Value |
|---|---|
| Input voltage (+12V) | 15–10.6VDC |
| Input current | 65mA standby; peak RF transmission current 400mA |
| IN 1 Burg/Fire input voltage | 15–9VDC |
| IN 2 / IN 3 max loop voltage | 15VDC |
| IN 2 / IN 3 max loop current | 1.2mA |
| End of Line Resistor (EOLR) value | 10K |
| PGM outputs | Open collector, max 3V active / 15V not active; max sink current 50mA |
| Dimensions (w/o antenna) | 4.8" x 7" x 1.2" (12 x 17.8 x 3 cm) |
| Mounting | Two vertical slots for #8 hardware |
| Operating temperature | -10°C to 49°C (14°F to 120°F) |
| Humidity | 95% non-condensing |
17 terminals are located at the bottom of the SLe-GSM PC board:
| Terminal | Function |
|---|---|
| TB1 | PWR (+12V) |
| TB2 | PWR GND (–) |
| TB3 | PGM1 (–). Open collector, normally active low; goes high on trouble. Can dedicate a zone to SLe-GSM trouble via an EOL resistor. Reconfigurable via the Management Center (napconoc.com). |
| TB4 | PGM2 (–). Default: "Fail to Communicate" (open collector/high normally, active low on failed report). Reconfigurable. |
| TB5 | PGM3 (–). Default: "Telephone Line Cut" (open collector/high when 24V telco voltage correct, active low when too low). Reconfigurable. |
| TB6 | IN 1 (B/F). Active-high input wired to the control panel bell output: steady high = burglary alarm, pulsing temporal high = fire alarm, CO pattern = CO alarm. Also usable as arm/disarm status input (high=armed, low=disarmed). Note: with Napco Armed Lugs (E4/E15), use IN 2 or IN 3 instead of IN 1 for armed status. |
| TB7 / TB9 | IN 2 / IN 3. Active-low inputs by default; jumpers 4/5 make them supervised EOL-resistor inputs triggerable by N/O or N/C relay contacts (wire common ground to GND/TB8). As arm/disarm input: low=armed, high=disarmed. |
| TB8 | GND — common ground terminal. |
| TB10 / TB11 | TIP / RING — for backup reporting, house tip/ring telephone wires route here; normally wired to panel tip/ring so transmissions can be monitored. If voltage falls below 3V, a Telco Line Fault is detected and the SLe-GSM applies telephone line voltage to the panel's Tip/Ring so it can still send alarms. |
| TB12 / TB13 | PANEL RING / PANEL TIP — see wiring diagrams. |
| TB14–TB17 | RTS (R) / PANEL TX (B) / PANEL RX (G) / CTS (Y) — wired to the SLe-DLEXT download extender to allow control panel downloads of GEM-X255, GEM-P9600, GEM-P3200, GEM-P1664, GEM-P1632, GEM-P816, and Freedom F-64 panels when the SLe-GSM is mounted remotely. |
| LED Blinks | Power (dBm) |
|---|---|
| 8 (strongest) | -55 |
| 7 | -65 |
| 6 | -75 |
| 5 | -85 |
| 4 | -91 |
| 3 | -95 |
| 2 | -99 |
| 1 (weakest) | -105 |
| Jumper # | Jumper ON | Jumper OFF |
|---|---|---|
| 1 | Not used | Not used |
| 2 | 4/2 with Checksum Pulse Format | 4/2 Pulse Format |
| 3 | Backup Mode | Primary Mode |
| 4 | 10K EOLR required | No EOLR for Zone 3 |
| 5 | 10K EOLR required | No EOLR for Zone 2 |
For primary reporting (no telephone lines present, connected directly to panel Telco terminals), do NOT install jumper 3 in block X5. For backup reporting, install jumper 3 — the SLe-GSM automatically switches from telephone line to GPRS network when it senses telephone line trouble.
| NOC Telephone # | Max Retry Attempts | Comments |
|---|---|---|
| Primary | 3 | Primary central station telephone number used |
| Backup | 6 | Backup central station telephone number used |
The radio constantly supervises GPRS network coverage. When configured for primary reporting and a loss in network coverage is detected, the unit can be configured (via the Management Center, napconoc.com) to prompt the control panel to announce a Telco Line Cut failure trouble. This will NOT activate when configured for backup reporting. By default, the SLe-GSM is NOT configured to cause a Telco Line Cut failure trouble and will not annunciate at the keypad.
Control panels can provide power through their Auxiliary Power terminals if the available standby current is reduced by 65mA. When there is insufficient standby current (e.g. 24-hour standby required for Residential Fire), the SLE-SMTCHG Smart Charge Module accessory must be used to charge an additional battery and supply the standby current.
Create a new account and register specific SLe-GSM modules at www.NapcoComNet.com. Accounts/modules registered online are enabled for activation within 24 hours.
Warning: To ensure user safety and satisfy FCC RF exposure requirements, this unit must be installed with a minimum separation distance of 60cm (24") between the antenna and nearby persons. Use only the antenna supplied with the SLe-GSM.
Use 22-gauge wire for runs up to 50 feet from the control panel, or 18-gauge wire for up to 100 feet. If the central station receiver format is "4/2 with checksum," install jumper #2 in block X5.
Primary Mode (remove jumper #3): 5-wire connection — TB1 (PWR +12V), TB2 (PWR GND), TB13 (PANEL TIP), TB12 (PANEL RING), and TB3 (PGM1, normally-low output wired to the (+) of a zone dedicated to monitoring radio status — programmed as a Day Zone with local sound only, not the bell).
Backup Mode (install jumper #3): 7-wire connection — TB1 (PWR +12V), TB2 (PWR GND), TB10 (TIP), TB11 (RING), TB13 (PANEL TIP), TB12 (PANEL RING), and TB3 (PGM1, same as above).
For power: connect TB1/TB2 without applying voltage first. If the Aux Output can't supply the necessary current, use the SLE-SMTCHG Smart Charge Module with an additional battery. For telco wiring, reference the correct wiring diagram for the specific control panel and connect the panel's TELCO TIP/RING terminals — do NOT connect the SLe-GSM's TB10-13 terminals to house telephone lines (RJ31X modular plug wires, etc.).
The SLe-GSM requires 12VDC, drawing less than 65mA in standby and almost 400mA during transmissions (for less than 1 second). Attach the antenna before applying power.
After triggering channels, verify online: go to www.napconoc.com, log in, enter your Company ID and SLe-GSM Radio Number, then click Signal Log. Confirm with your central station that the signals were properly received.
The manual includes detailed wiring diagrams for the following panel families in both Primary (telephone line not available) and Backup reporting configurations, with and without the SLE-SMTCHG Smart Charge Module (when 65mA standby current is unavailable):
For exact pin-to-pin wiring diagrams for your specific panel model, refer to the original PDF manual (linked above) — each panel family has a dedicated diagram page showing the AUX POWER, TIP/RING, RJ31X, and Smart Charge Module connections.
Program the central station receiver reporting format using PCD-Windows Quickloader download software (Digital Communications screen, Central Station Receivers tab). If using "4/2 with checksum" (pulse format with Sum-Check box checked), install jumper #2 in block X5.
Supported alarm reporting formats: Contact ID, Ademco Slow, Radionics Fast, Silent Knight Fast, Radionics Slow, Universal High Speed.
Caution: Always ensure an area code is programmed into the control panel.
| Event | Contact ID Code | Pulse 4/2 |
|---|---|---|
| Zone 1 Fire | E110 | 11 |
| Zone 1 Burg | E130 | 31 |
| Zone 2 Panic | E120 | 22 |
| Zone 3 Trouble | E300 | F3 |
| Low Battery/Voltage | E302 | F4 |
| Tamper Trouble | E341 | F5 |
| Line Cut | E352 | F6 |
| Reboot | E625 | F7 |
| Panic Alarm | E123 | — |
| Holdup Alarm | E122 | — |
| Medical Alarm | E100 | — |
| Opening / Closing | E401 / R401 | — |
| A.C. Trouble | E301 | — |
| Tel 1 Fail | E351 | — |
These codes and zone numbers can be changed via the Management Center screen (napconoc.com). Upon alarm, the SLe-GSM sends an SMS with the appropriate Contact ID alarm code, including zone/user number.
Three methods for annunciating detected troubles (shown on the Red Trouble LED D5):
Napco Security Systems, Inc. warrants its products free from manufacturing defects in materials and workmanship for 18 months following the date of manufacture. Napco will, at its option, repair or replace any product failing to operate correctly, at no charge to the original purchaser/user, within that period.
This warranty does not apply to equipment repaired by others, improperly installed, improperly used, abused, altered, damaged, subjected to acts of God, or with altered/defaced/removed serial numbers. There are no other express or implied warranties, including merchantability or fitness for a particular purpose. Any breach-of-warranty action must be brought within 6 months following the end of the warranty period. Napco is not liable for consequential or incidental damages.
To exercise the warranty, the product must be returned by the installing security professional, shipping prepaid and insured, to Napco. Napco recommends the entire system be completely tested weekly.
Warning: Despite frequent testing, due to criminal tampering, electrical/communications disruption, or other factors, it's possible for the system to fail to perform as expected. Napco does not represent that the product/system cannot be compromised or circumvented, or that it will prevent all personal injury or property loss. A properly installed and maintained alarm may reduce risk but is not insurance or a guarantee against burglary, robbery, or fire.
Napco Security Systems, 333 Bayview Avenue, Amityville, New York 11701. Sales/Repairs: (800) 645-9445. Technical Service: (800) 645-9440. Publicly traded on NASDAQ, Symbol: NSSC.
Sign up to get the latest on sales, new releases and more …