System Enhancement Module (SEM) for VISTA w/ Telus LTE and IP Communication

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The ADC-SEM340-VT-TL is a dual-path communicator for the TELUS cellular network, which operates in Canada. It's compatible with Vista security panels. Purchase your from Alarm Grid, today!
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The ADC-SEM340-VT-TL is a dual-path communicator. It is designed specifically for your VISTA security system. This SEM module operates on the TELUS cellular network, which is in Canada. It connects to Vista security panels, providing a secure and reliable connection to the platform. U.S. users can instead use the Verizon or AT&T LTE communicators.

The ADC-SEM340-VT-TL is compatible with the Honeywell/ADEMCO VISTA-10P, VISTA-15P, VISTA-20P, and VISTA-21IP panels and their First Alert equivalents. For VISTA-10P you must have a revision 2.0 or higher. For the VISTA 15P and 20P, you must have a minimum revision of 5.2. The 21IP requires a revision 3.1 or higher. The VISTA 15P and VISTA 20P with a revision under 5.2 but at least 3.1, will still operate but without the ability to communicate over broadband. When this SEM module is being used, there can be no other communication option or communicator connected. This is why on the VISTA-21IP, the internal IP/GSM jumper switch must be set to the OFF position.

This dual-path communicator has a built-in Ethernet port and Telus cellular module. The ADC-SEM340-VT-TL requires a cellular monitoring plan from an authorized dealer. For Alarm Grid customers, this would be a Gold plan (self or full) or higher. does not allow you to use internet-only monitoring options.

Installation of the ADC-SEM340-VT-TL is simple. It requires mounting the communicator on the wall and connecting four (4) wires. The four (4) wires connect directly to the Vista panel. Two (2) wires for data and two (2) wires for power. There is no need for a separate transformer to take up outlet space. Once installed, you will need to enable a keypad address in the Vista panel. The default address is 23, which is enabled in field *196 of Installer programming. It is identical to enabling the device address for a 6150 or 6160 keypad. Then, it will need to be configured with by the alarm dealer.

What makes the ADC-SEM340-VT-TL special is that it also has a built-in Z-Wave Plus controller. This allows you to enroll Z-Wave devices into the communicator via the app or customer website. These Z-Wave devices can include things such as light, locks, and thermostats. After enrollment, control these devices even when you are away from home. If you prefer to use a Tuxedo keypad that has a built-in Z-Wave controller, you will lose the ability to control Z-Wave from

The following are some very important compatibility notes.

The SEM is compatible with Touchscreen Keypads such as the Honeywell Home Tuxedo. Arming, Disarming, Panics and Alarms initiated through these keypads are processed through However, changes to the Installer Code via Quick Programming Mode and bypassing of open sensors through the touchscreen will not be processed by unless they are performed by getting into Console Mode. To use the "Bypass Open Sensors" feature on, panel programming field *23 Forced Bypass must be enabled, and is not enabled by default.

The AVS (Audio Verification System) is incompatible with the SEM. If the panel is using an AVS system, it must be removed in order for the SEM to function properly. The 4232CBM (Connected Building Module) is also not compatible with the SEM. And Plain Old Telephone Service (POTS) is incompatible with the SEM. When a SEM communicator is being used, it should be the only communication option for alarm signaling.

SAM (Sensor Activity Monitoring) is not available for the 5822T Tilt Sensor. Be sure SAM is disabled for any of these sensors.


  • Product Type: System Enhancement Module (SEM) Communicator
  • Compatibility: Honeywell & ADEMCO VISTA P-Series Alarm Panels and their equivalents
  • Minimum Panel Firmware: VISTA-15P VISTA-20P Version 5.2+ ; VISTA-10P Version 2.0+ ; VISTA-21iP Version 3.1+ (Check PROM Chip)
  • Panel Interfaces: Two Keypad Bus Connections (Data In, Data Out) 12V Power and Ground
  • IP Communication: Wired Ethernet
  • Cellular Carrier: Telus LTE
  • Cellular Networks: 4G LTE w/ 3G HSPA, and 2G GSM fallback
  • Automation: Z-Wave Plus
  • Interactive Platform:
  • Over-the-Air (OTA) Updates: Yes
  • Tamper Switches: Cover and Wall Detection
  • Power Requirements: 12V Nominal, 125 mA Continuous, 230 mA Max
  • LED Lights: Five (5) Total
  • ETL Listings: UL985, UL1023, and ULC S545
  • Operating Temperature: 14℉ - 131℉ (-10℃ - +55℃)
  • Storage Temperature: -30℉ - 140℉ (-34.4℃ - +60℃)
  • Humidity: 90% Relative Humidity, Non-Condensing
  • Enclosure Dimensions: 7.66"L x 4.35"W x 1.65"D (19.46cm x 11.05cm x 4.19cm)
  • Enclosure Color: White
  • Case Material: Fire-retardant PC/ABS, PC

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