Honeywell Home LTEM-PA Posts

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On July 5, 2022 Resideo announced that all LTEM-PA, LTEM-PV, LTEM-PIA, and LTEM-PIV communicators will undergo a slightly revised activation process. Upon registration, if the communicator is not using the latest firmware version, it will automatically receive an Over-the-Air (OTA) update.

This announcement came in the form of MyWebTech Technical Notification #83. For those communicators with a WIFI or Ethernet connection, the OTA update will be performed using this communication path. If WIFI or Etehrnet is not available, then cellular data will be used. The update process typically takes about five (5) minutes, but when cellular is the only communication path available, it may take longer. The length of time a cellular upgrade takes also depends on the cellular signal strength.

During the update, the communicator's LED's will light according to where the communicator is in the two-stage process:

  • Firmware Downloading: REG, Status, and Fault LEDs will fast-blink in unison.
  • Upon Firmware Completion: The device will reset, then all five (5) LEDs, REG, Status, Fault, Cell, and WIFI/Ethernet will fast blink in sequence.

The OTA software update will cause the communicator to generate a few different messages to the central station. These messages indicate the beginning and end of the software update process. The messages sent are as follows:

  • E903 - Application Code Update (Remote Download begins)
  • R903 - Application Code Update Restore (Remote Download Completed)
  • E904 - Application Code Update Failure (Remote Download/Update Failed)

For Alarm Grid customers, this notice means that if you are using one of the LTEM-P Series communicators listed above, it is more important than ever that you have your equipment installed and ready when your activation appointment time rolls around. In particular, anyone who will be using cellular communication only, as any OTA update required may take some time to complete, and we currently have no way of knowing how long.

If you have any questions about this notice, reach out to your alarm dealer for details. If you are an Alarm Grid customer, you can send us an email at support@alarmgrid.com. We're here Monday - Friday from 9:00 am - 8:00 pm Eastern time to answer your questions.

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An announcement on the AlarmNet360 page shows that they will send a remote reset command to some LTEM-PA, LTEM-PV, LTEM-PIA, and LTEM-PIV radios. This will occur today, Friday 04/15/22 between 2:00 pm - 3:00 pm ET. This may cause a trouble condition, and queued alarm reports could be sent.

It's unclear why this is being done. After a successful reset occurs, the radio will send an "E339-EXP. Module Power ON / Reset" message to the monitoring station. If the radio was in comm failure prior to the reset and any unsent alarm signals were queued, this reset may cause those alarm messages to be sent. These signals would show up immediately following the E339 signal at the central station. We assume this would also cause the same alarm messages to show up in Total Connect 2.0, and to be sent as notifications.

In addition, depending on how the panel is programmed, this event may cause the panel to display a bF or Check 103 message, and could also cause trouble beeping from the keypad. Disarming the system twice should clear the message and return the system to its normal state.

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A convenient option when using a 3G or CDMA radio on a VISTA panel was the ability to share a single transformer for both devices. This was possible because both units used AC power. The new LTEM-PA and LTEM-PV communicators use a DC transformer, so attempting to share will cause issues.

The Resideo LTEM-PA and LTEM-PV dual-path communicators are a part of the new ProSeries lineup. In addition to these communicators, the Honeywell Home PROA7 and Honeywell Home PROA7PLUS and the Resideo PROA7C and Resideo PROA7PLUSC help to make up the ProSeries. These products may seem to make strange bedfellows, but the modular design shared by the All-in-One (AiO) panels and the stand-alone communicators is no accident. With some modules, such as the LTE communicators being shared between the two product lines. This is one reason why the LTEM-PA and LTEM-PV use DC power, rather than AC.

It's a natural assumption to make, thinking that since the older communicator from a particular manufacturer was an AC step-down transformer, the new communicator would employ a similar design. But in this case, that assumption can get you into a lot of trouble. Attempting to keep the original transformer from the 3G or CDMA communicator in place, and just connecting the LTEM-PA or LTEM-PV in place of the older one, can damage the VISTA panel, the transformer, or both.

The symptoms seen by Resideo Tech Support, when this mistake has been made are as follows:

  • The transformer is damaged. Once this occurs, the VISTA panel will show an AC loss condition. Naturally, the next step is to replace the bad transformer with a good one. This can lead to the second symptom that has been seen.
  • The VISTA board is damaged. Once the damaged transformer is replaced with a new one, feedback on the panel's power circuit causes one or more of the diodes on the VISTA board (above terminals 1 and 2) to become damaged. This can cause a burning smell and may even cause the panel to catch fire in a worst-case scenario.

In the image below, you can see a damaged diode. This area of the printed circuit board is just above Terminal 1 and Terminal 2 on a VISTA panel.


It is possible for the LTEM-PA or LTEM-PV to receive power from the panel so that only one transformer is required in the setup. However, the power comes from the 12 Volt DC auxiliary power output, not the transformer. You can see how to properly configure that setup in this helpful FAQ.

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Until now, only alarm systems manufactured by Resideo, Honeywell Home, or Honeywell could be used with Total Connect 2.0. That changes with the new LTEM-P Series communicators. Some DSC and Interlogix panels can now be connected to and used with TC2. A supplemental wiring guide is provided.

The LTEM-PA AT&T LTE Communicator, and the LTEM-PV Verizon LTE Communicator available from Resideo can be used to send alarm signals on behalf of all the same VISTA panels that were compatible with the older AlarmNet communicators such as the Honeywell LTE-IA, and the Honeywell LTE-IV. In addition, certain versions of some of these panels can also be used with Total Connect 2.0 Remote Services when one of these communicators is attached to it.

With the release of the LTEM-P Series communicators, DSC PC1616, DSC PC1832, and DSC PC1864 panels can support both reporting through the communicator when it is connected to the panel's keypad bus, and integration with Total Connect 2.0. In addition, Interlogix NX8E, NX-4V2, NX-6V2, and NX-8V2 panels can also be used with the LTEM-P Series communicators to both send signals, and integrate with TC2.

With the DSC PC Series panels, this is a purely keypad bus connection. The communicator's RX, TX, and Ground terminals will connect to the DSC panel's Green, Yellow, and Black keypad bus terminals. On the Interlogix NX Series panels that are supported, there is a connection to RX on the communicator from the terminal marked DATA on the panel's keypad bus. COM from the NX Series panel will connect to GND on the Communicator. In addition to this, the LTEM-P Series communicator will require a Resideo PRODCM Dialer Capture Module, which will connect to the panel's Tip and Ring terminals. The PRODCM will be installed inside the communicator. Panel signals are sent via the PRODCM, and Data Bus information for Total Connect 2.0 is sent from the bus.

There are some programming options that will need to be configured properly, for example the NX panel must be set to report in Contact ID format. In fact, all signals for both panel types will be sent to the monitoring station using Contact ID. The wiring connections should be made while both the panel and communicator are powered down. The alarm panel is powered up first, and all troubles, faults, and alarms must be cleared. Once they are, power up the communicator and it should begin to scan the panel's bus for zone information. This process can take up to ten (10) minutes.

This is not meant to be a step-by-step guide to setting up this feature, it's just an introduction to the feature for those who may not be aware that it is available. If you have one of the compatible DSC or Interlogix panels, and you are considering using it with one of the LTEM-P Series communicators, check out the Resideo LTEM-P Series Installation Guide, the Resideo Supplemental Install Guide for Non-VISTA panels, and for those using a compatible Interlogix NX-Series panel, also check out the Resideo PRODCM Install Guide. We have not yet had an opportunity to create our own in depth FAQs for this process on the Non-VISTA panels, but we will get to those in the near future.

Have any thoughts about Resideo and Honeywell Home finally embracing the use of their communicators with competitor's panels? They offered a dialer capture module in the past, but it installed outside the communicator and was somewhat unwieldy. Leave a comment below and tell us what you think. We always look forward to hearing from our readers!

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