Industry News and Discussions Posts

2GIG strongly recommends that all Edge panels be updated to the latest firmware version, 3.1.1.016. This firmware has a number of new features and bug fixes. New features include Z-Wave siren support and updated remote keypad features. For a full list of updates, read the release notes.

The 2GIG Edge supports a WIFI connection in addition to the AT&T or Verizon cellular communicator that comes built-in. For any Alarm.com panel that is connected to WIFI, OTA (Over the Air) firmware updates that are downloaded to the panel using WIFI are free. However, for those panels that don't have access to WIFI, a firmware update that is sent to the panel via cellular data usually incurs a small fee. Alarm Grid passes this fee on to our customers with no markup, when it is assessed.

But, for a limited time, Alarm.com is offering to update the 2GIG Edge panel automatically with no fees assessed, even when the firmware has to be downloaded via cellular data. That's how important 2GIG and Alarm.com feel this update is. Beginning on Monday, September 12, 2022, Alarm.com will push the latest firmware to all monitored 2GIG Edge panels.

These automatic updates will take place only during daylight hours, and only when the alarm panel is disarmed. When the firmware update is complete, the alarm panel will reboot. This is a normal part of the update process. Additionally, if there are any remote keypads associated with the panel, they will also be updated once the main panel has completed its update. Alarm.com expects the process of updating all 2GIG Edge panels to be completed by the end of October 2022.

If you'd like to go ahead and update your panel immediately, you can access the necessary files for the update on our 2GIG Edge Firmware Update Page. Instructions for updating the 2GIG Edge can be found in this helpful FAQ. Otherwise, do nothing and your panel will be automatically updated OTA by Alarm.com at no charge, in the near future.

Labor Day has honored the contributions of workers as an official Federal Holiday since the year 1894. As a thank you to our employees, Alarm Grid will be closed on Monday, September 5, 2022, for the Labor Day Holiday. We will not be in the office that day to answer support questions.

But just because we won't be in the office providing technical support, helping to plan new systems, and activating monitoring for new customers doesn't mean that we aren't taking care of our customers. Our monitoring station partners, Criticom Monitoring Service (CMS) and Rapid Response are available 24 hours per day, 365 days per year to respond to any alarms, troubles, or environmental situations that may arise.

Alarm Grid monitored customers in the United States receive their monitoring service from Criticom (CMS). When your Alarm Grid monitored system sends a signal, it is a CMS operator who receives it and then processes it based on a pre-set list of instructions. Alarm processing may involve sending authorities immediately, or calling the premises and a list of contacts to determine if an emergency exists before a dispatch occurs. Whatever the instructions, the process takes only moments to complete.

If you need to contact CMS, either to put your system on test, or to report that an alarm does not require a dispatch, you can get in touch by calling (888) 818-7728 and choosing Option 9. When you contact them, be sure to have the proper information ready. They will need your name, address, and your false alarm password or phrase. This is very important! If you call either monitoring station during an alarm, and you provide an incorrect password, they will be required to dispatch authorities at that point.

For our Canadian monitored customers, you receive monitoring service from Rapid Response. If you need to contact them you can call (800) 932-3822 and follow the prompts. You should only be contacting them for issues such as putting your system on test, or canceling a potential dispatch due to an accidental alarm. Rapid Response can't provide you with technical support or make changes to your account either, so if you need that type of help, please contact us instead. You can email support@alarmgrid.com with details of what you need and we will respond as quickly as possible when we're back in the office on Tuesday, September 6, 2022.

The contributions of workers in building and maintaining both of these great nations cannot be overstated. Alarm Grid wishes you a happy, safe, and relaxing Labor Day! We'll see you back here on Tuesday, September 6 to pick up right where we left off. Until then, we hope you can enjoy this brief respite, you've earned it!

Alarm panel manufacturers routinely offer panel firmware updates. This allows them to add features and correct issues. However, most DIY users don't have access to the restricted portion of the company's site where these files are housed. Alarm Grid offers the latest firmware file downloads.

Most alarm panels can be updated Over-the-Air (OTA) using either Alarm.com or AlarmNet360. AlarmNet never charges anything for these updates, and Alarm.com also offers them for free, unless they have to be sent to the panel using cellular data. In that case, the update will incur a small fee, depending on the size and number of updates that need to be sent.

Qolsys panels will not perform an OTA update unless the panel is connected to WIFI. If you have one of these panels installed in a location where WIFI is not available, then the only option is to either update using a cell phone as a WIFI Hotspot, or download the firmware files, and then install them via either Micro SD Card (IQ2/IQ2+) or Access Point (IQ4).

Honeywell L5200, L5210, and L7000

Honeywell used to offer free firmware updates for the LynxTouch panels that they pushed remotely using AlarmNet360. It was a messy process, AlarmNet tech support was required to request these updates individually, per account. So, sometime after the introduction of the Lyric panel, they stopped this practice. The Lyric can only be firmware updated using AlarmNet360, but the update can be requested by the dealer, and now, the customer can also request the firmware update via the panel. When Honeywell, now Resideo, ceased offering OTA updates for the LynxTouch panels, they released the Honeywell LYNXTOUCH-MSD Firmware Update Tool. This tool can be used to update the L5200, L5210, or L7000 panels.

When an L5200 is updated to the latest version, it becomes an L5210 internally, though there are certain physical traits of the L5200 that won't change, like the screen size. Depending on when you purchased the LYNXTOUCH-MSD tool, it may come with the latest firmware version already on the SD Card (it comes with both L5210 and L7000 firmware already loaded). However, if you purchased your update tool when they were first released, it will have an older firmware version on it, and you will need to download the newest firmware to the SD Card and update the panel again to get the most current version. The update files are housed on the Resideo website in the password-protected portion of MyWebTech, so we offer the files for download from our site:

• L5200 or L5210 LYNXTOUCH-MSD Firmware Update Page
• L7000 LYNXTOUCH-MSD Firmware Update Page

2GIG Go!Control 2 (GC2) or 2GIG GC2e

The 2GIG GC2 and 2GIG GC2e have a couple of different methods for updating the firmware. There is the 2GIG UPDV Easy Updater Tool and the 2GIG UPCBL2 Firmware Update Cable. The updater tool is geared more toward a professional installer who will be updating multiple different panels over the course of years. It comes with a version of either the 2GIG GC2 or GC2e firmware loaded but the tool itself will then have to be updated when newer firmware is released. The files to load are available from our site and are linked below.

The updater cable is the method of update most DIY users choose to use. It requires that the user have a windows computer available. The cable is a fixed length, so the computer that will be used needs to be near the alarm panel in order to perform the update. Ideally, a laptop is used. Instructions for using the updater cable to load the latest firmware onto a 2GIG GC2 or 2GIG GC2e can be found here. Instructions for loading new firmware onto the 2GIG UPDV Easy Updater Tool can be found here. Instructions for using the updater tool to update a 2GIG GC2 or GC2e panel once it has the latest file loaded can be found here.

The 2GIG GC2 and 2GIG GC2e firmware pages are linked below. Each page has both Updater Tool and Updater Cable files:

• 2GIG GC2 Firmware Update Page
• 2GIG GC2e Firmware Update Page

2GIG GC3 and 2GIG GC3e

The 2GIG GC3 and 2GIG GC3e technically use the same firmware. The 2GIG GC3e was released at firmware version 3.2.1, so any GC3e panel will have at least this version of firmware already installed. Alarm Grid offers firmware versions 3.0.1 up through 3.2.4.6725 on our 2GIG GC3 Firmware Update Page. On our 2GIG GC3e Firmware Update Page, we offer 3.2.3.6713 up through the current version which, at the time of this writing, is 3.2.6.6770.

The 2GIG GC3 and 2GIG GC3e are both much easier to update than the 2GIG GC2 or GC2e. Both 2GIG GC3 versions offer WIFI, which makes OTA updates simple, as well as free. For systems that need it, an OTA update can be pushed from Alarm.com via cellular for a nominal fee. Again, Alarm Grid offers this type of upgrade to our customers at our cost, with no markup. If WIFI is not available at the panel, and a user doesn't want to pay for an OTA update, we offer the upgrade files from our site. This FAQ provides a walkthrough on how to perform the update using the files from our site. Instructions for performing the update are also listed on the page along with the firmware files.

• 2GIG GC3 Firmware Update Page
• 2GIG GC3e Firmware Update Page

2GIG Edge

The 2GIG Edge updates in the same way as the 2GIG GC3 and GC3e. It has a USB port located on the top of the panel. Once the firmware update file has been loaded onto the root directory of a USB drive, the drive is inserted into the port on the panel's top and the panel prompts the user to update. For full instructions on updating a 2GIG Edge, check out this FAQ.

• 2GIG Edge Firmware Update Page

Qolsys IQ Panel 2 and IQ Panel 2 Plus

The IQ Panel 2 and IQ Panel 2 Plus also use the same firmware version. The difference between the two panels is hardware. The IQ Panel 2 does not support PowerG, and the IQ Panel 2 Plus does. As noted above, Qolsys panels will not download firmware updates via cellular data, so the options are to connect the panel to WIFI, temporarily connect the panel to a Hotspot on a cellular phone, or update locally using a Micro SD Card. The step-by-step instructions for loading the firmware from an SD Card are shown on the firmware update page.

• Qolsys IQ Panel 2 Firmware Update Page (Version 2.3.1-ADCS 5.18-ADCL)
• Qolsys IQ Panel 2 Plus Firmware Update Page

Qolsys IQ Panel 4

The Qolsys IQ Panel 4, like the previous IQ Panels, will not download firmware updates via cellular data. However, unlike the IQ Panel 2 or IQ Panel 2 Plus, the IQ Panel 4 does not have a Micro SD Card slot. Instead, if WIFI is not accessible by the panel, either directly or via a cell phone Hotspot, then the firmware update files have to be downloaded to a phone or tablet, then the phone or tablet must be connected to the IQ Panel 4 Access Point, and the files then loaded to the panel from the phone or tablet. Instructions for updating using the Access Point are available on the firmware download page.

• Qolsys IQ Panel 4 Firmware Update Page

Above are links to all the different panel firmware pages we offer here on the Alarm Grid site. In addition to alarm panel firmware, we also offer some firmware pages for the Honeywell Home TUXEDOW or Resideo TUXEDOWC touchscreen keypads as well as the older Tuxedo Touch firmware. We don't have a page for the older 6280 touchscreen keypads, but if you need access to that firmware, send an email to support@alarmgrid.com letting us know what you need and we can get you access to it.

As mentioned above, the Lyric panel can only be updated via AlarmNet360 and in order to update the firmware, the panel has to be actively monitored. The same is true of the newer Honeywell Home and Resideo ProSeries panels (PROA7, PROA7PLUS, PROA7C, and PROA7PLUSC). These panels must be actively monitored and registered with AlarmNet360 before an update can be applied to them.

Johnson Controls released a Technical Advisory Bulletin on Monday noting that some PowerSeries Neo, Pro LTE, and Internet Dual-Path Communicators have labeling errors. The serial number on the box appears to be incorrect. Comms built between August 15, 2021, and July 29, 2022, are affected.

The model numbers affected are the DSC TL880LECVZ, TL880LECAT, TL880LEBAT, TL880LEBTL, and TL880LECTL. This is a labeling error only and does not affect the signal transmitting, or Alarm.com remote control capabilities of these communicators in any way. The mixup seems to be with the name on the label on the product, and the serial number on the label on the box.

The model name listed on the label of the product is incorrect, while the serial number listed on this label is accurate. The model name listed on the sticker for the box is correct, but the serial number listed on the box is incorrect. So, be sure when registering one of these units that you use the serial number from the sticker for the product and not the one from the box.

The following products, built during the listed date range, are affected:

Beginning July 29, 2022, new, updated and correct labels should be placed on these products. Remember, the performance of communicators that were manufactured during this timeframe is not compromised. This is only a labeling error, so as long as the serial number taken from the sticker affixed to the product itself, or the IMEI number from the printed circuit board is used everything should work as intended. DSC offers a handy Date Code Lookup tool at this site. You can find information on looking up a date code for any DSC product on that page.

The fact that this issue wasn't discovered sooner seems to indicate that this is a very minor issue. What do you think about this announcement? Do you often use these communicators? Have you run across this issue? Leave us a comment below and tell us what you think. We always enjoy hearing from our readers. That's all for today, until we meet again, stay safe!

Resideo announced last week that due to a required component becoming obsolete, they are forced to discontinue the popular 5800FLOOD sensor. There is still some available stock, so Alarm Grid has not yet discontinued it, but once all stock has been exhausted, the 5800FLOOD is gone for good.

The 5800FLOOD is popular because unlike the 5821, it doesn't require that a water probe be added to the sensor. Water detection is built-in, and configuration is easy. Another benefit of the 5800FLOOD is that it will alert for flooding more quickly than the 5821. The prongs of the 5800FLOOD need only be in contact with water for about 25 seconds before a signal is sent to the alarm panel. The 5821 flood probe must be in contact with water for about three (3) minutes before sending a signal.

In addition to flood sensing, the 5800FLOOD also monitors for extreme cold and/or hot temperatures locally. This is done using a temperature sensor that is built into the 5800FLOOD. For cold temperature sensing, if the ambient temperature drops below 45℉ (7.2℃) for more than 15 minutes, an alert is sent using Loop 1. For high-temperature sensing, if the temperature rises above 95℉ (35℃) for more than 15 minutes, then an alert is sent using Loop 2. The flood sensor transmits using Loop 3.

Now that the 5800FLOOD is being discontinued, the Resideo and Honeywell Home 5821 is the recommended replacement. One drawback to the 5821 is that it requires a remote probe be added for flood sensing, and for freeze sensing. However, only one (1) remote probe can be used per transmitter, so if you need to monitor for both flood and freeze, two (2) 5821s are required.

The 5821 supports the following functions:

For flood sensing, we recommend using the FP280 as it includes wiring, and the required resistor is already in place. With the 470PB, the user is responsible for providing their own wire and must add the 2.2 MΩ resistor themselves. In all cases, wiring between the 5821 and whichever remote probe is used should be made as short as possible, and should not exceed 96" (243cm). Be sure to read the full Install Guide for the 5821 for all of its various quirks.

Supply chain shortages claim another victim in the 5800FLOOD. It seems like only yesterday that we were excitedly telling you about it. What are your thoughts on the demise of this "New and Improved" environmental sensor? Leave us a note in the comments, as we always love hearing from our readers.

Power over Ethernet, also known as PoE allows power to be sent to a device using the same ethernet wire and RJ45 connector that is used for the network connection. Originally designed with VoIP phones in mind, PoE has quickly become a desirable option for IP cameras and other networked equipment.

Before we talk about PoE, we should discuss network cabling. Category 5 (Cat5), Category 5e (Cat5e), and Category 6 (Cat6) cables all consist of four (4) twisted pairs of wire, or a total of eight (8) conductors. The differences between these various categories of cable have to do with their ability to transfer data, over what distance, and at what speed. Generally, Cat6 is faster than Cat5 or Cat5e, and is less prone to crosstalk or noise issues.

The main point we want to make about network cabling, though, is this: With eight (8) conductors, any device that connects to a network using one of these cables, without using PoE, is wasting a number of wires. In fact, there are now cheaper cables out there that only have four (4) conductors, rather than the full eight (8). So, that brings us to two points. It makes sense that PoE has come into existence, and if you're preparing to use PoE devices, be sure you run cabling that will handle both data and power.

In PoE, there are a number of abbreviations commonly used:

The benefits of PoE are numerous, as you can imagine. Rather than having every camera in an installation require the use of an outlet, a PoE switch using a single outlet can provide both power and Ethernet to a multitude of cameras with a single Cat5 or Cat6 wire going to each. In many cases, Ethernet cabling may already be installed, particularly in commercial installations, thereby lowering installation costs for PoE equipment. Another benefit is that when each powered device is receiving its power from a PoE capable switch, it is often possible to restart a PoE-powered device remotely, without having to go to the device itself.

The IEEE 802.3 standard governs PoE Switches and PoE Injectors. There is no special cabling required with the exception that the standard called Ultra-PoE uses all eight (8) pins of the RJ45 connector, so this would be one instance where a cheaper 4-pin cable would not work.

The table below shows the IEEE 802.3 standards and their requirements:

There is a type of cable called CCA or Copper Clad Aluminum. Although this cable is fine for networking, it is not suitable for use with PoE. This is due to the aluminum core. Aluminum doesn't conduct as well as copper and has a higher DC resistance. This causes it to lose more power over distance and to get hotter. When working with PoE, stick with 100% copper cabling.

One of the things you may find difficult about using PoE is figuring out if you have enough power from the PSE for a PoE device. These specs are usually listed in Watts, rather than in the available current, which can further complicate things. Here, knowing which standard each device uses is most helpful.

Below, see the various PoE standards, and the power both supplied and required for each:

The variations in voltage and current at the PD (Powered Device) in the table above have to do with the length of the cable run. The longer the cable, the more power is lost. You may have noticed in the above table that the maximum cable length for each PoE Standard is 100 m (328'). This is actually a limitation of both Cat5 and Cat6 cables, as the maximum length of a single run for either type of cable is 100m. The minimum voltage and available power listed above assume a cable run of the maximum length.

So then, what if you need to run a cable further than 100m? For PoE devices, you would add a PoE extender. Specifications may vary, but usually, each PoE extender can add another 100 m of cable length between the PSE and the PD. Usually, each PoE extender is only good for a single PD. Not all PoE extenders are the same, though, and some may not support daisy-chaining, while others do. Check out the specifications of any PoE extender you choose to use if you find yourself in a position to need longer cable runs.

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.

The Resideo LTEM-PA and LTEM-PV are dual-path capable communicators that use the LTE Cat-M1 network. During the global chip shortage, these radios have come to prominence because of their availability in the absence of other LTE communicators. They provide nearly the same speed as LTE comms.

Another feature that differentiates the LTEM-PA and LTEM-PV from other communicators is their modular design. These radios are considered a part of the ProSeries lineup, which includes the Honeywell Home PROA7 and PROA7PLUS and the Resideo PROA7C and PROA7PLUSC. The reason for this is that many of the add-on modules that can be used with the ProSeries panels can also be used with the LTEM-P communicators. Including the PROWIFI or PROWIFIZW, the PROLTE-A or PROLTE-V, and the PRODCM.

The LTEM-P Series communicators support an ethernet connection, but if you find yourself in a situation where a wired connection is not possible, then you can install the PROWIFI or PROWFIZW, which will give you WIFI, or WIFI and Z-Wave Plus capabilities. The ability to add a modular cellular unit is exciting as it allows you to install a separate LTE communicator to use instead of the built-in LTE Cat-M1 communicator. This will come in handy if you purchase an AT&T LTEM-PA, but find out later that Verizon would provide a better signal in this particular installation. Also, far in the future, when LTE is eventually phased out, whatever takes its place can easily be installed in the unit, rather than having to replace the entire communicator.

The PRODCM is a dialer-capture module. It allows the LTEM-P Series communicator to work with an alarm panel that has a built-in dialer and can report using Contact ID Format. The PRODCM installs inside a slot in the LTEM-P Series communicator, then two wires are connected between it and the Tip and Ring terminals on the alarm panel. The panel believe's it is dialing out over a phone line, but the module captures the signal, and transmits it via IP, or Cellular. Many of these add-on modules are also compatible with the ProSeries panels, which is why the LTEM-P Series are considered a part of the ProSeries lineup.

Tip 1: Power Wiring

The LTEM-PA and LTEM-PV come with a 9VDC power supply. Depending on the communicator you may be replacing there could be an existing AC Transformer in place. Do not make the mistake of trying to use the existing transformer. You have two (2) options when it comes to powering the LTEM-PA or LTEM-PV. You can use the included power supply, making sure to observe proper polarity with the power wires, or you can wire it so that the communicator receives all its power from the alarm panel. If you choose the latter option, be sure to calculate the current draw for the communicator correctly, and if you decide to leave the battery out of the LTEM-P Series device, turn off the radio's Low Battery Reporting.

Tip 2: Installing A WIFI Module

If you want to add support for WIFI to your LTEM-P module, you can add the PROWIFI module. When the PROWIFI module is installed, the ethernet connection becomes unavailable, so you can only use one or the other of these, but not both. If you want to add both WIFI and Z-Wave Plus capabilities to your system, then you can choose to install the PROWIFIZW.

Using the PROWIFIZW can add Z-Wave support in a situation where it would otherwise be unavailable, such as when using the LTEM-P with a non-VISTA panel. The PROWIFIZW cannot be used as a secondary controller, so it can't be used to extend the range of another controller such as the Tuxedo or VAM. Using the PROWIFIZW also doesn't give you an option to create scenes through Total Connect 2.0, only manual control of Z-Wave devices is available.

Tip 3: Always Default the Communicator

We've found, through painful experience, that it is a good idea to always default the LTEM-PA or LTEM-PV once all the wiring is completed, prior to account creation and activation. To default, hold down the red button on the upper right side of the main communicator board for at least 20 Seconds. The LEDs on the communicator should begin going through their initial power-on sequence. This is how you can tell the default has completed.

Once the communicator has booted completely up, then do one last power cycle. Do this by unplugging the transformer and disconnecting the red battery lead. If the communicator is being powered completely by the panel, simply power the panel down and back up by unplugging its transformer and backup battery. If the communicator battery is still connected though, be sure to disconnect this battery as well to completely power the communicator off. Wait about 30 seconds, then power back on as you normally would. For VISTA panels, plug in the transformer, then the battery. If the communicator has its own DC Power Supply, plug in the communicator battery, then plug in the power supply. Now you can proceed with programming and activation.

Resideo has reported that Verizon cellular communicators may experience issues connecting to Total Connect 2.0, issues with commands taking longer than usual to process, or failing completely. This is due to an SMS issue with the carrier which began at 11:00 pm Monday night.

As of this writing, the issue is ongoing and could last for some time. Only Verizon cellular communicators are affected, AT&T communicators and dual-path communicators where the IP path is present are not affected. This issue does not affect the Verizon cellular communicator's ability to send alarm signals!

If you have a Verizon communicator and are experiencing issues with Total Connect 2.0, please be patient. Verizon is aware of the issue, and they are working to correct it. At this time, only Resideo has reported an issue with Verizon communicators. If that changes, we will let you know.

Resideo and Honeywell Home, formerly Honeywell, released an announcement last week that they will change their date code format from a YDDD (Year, Day of the year) format, to use YYWW (Year, Week of the year). This is being done, ostensibly, to simplify the decoding of date codes for users.

Product date codes are important for determining whether a product is still under warranty, as well as whether it may be affected by a particular anomaly that may have occurred because of an issue in the manufacturing process. For Carbon Monoxide detectors, which always have a finite useful life, the manufacturing date code is important to help determine when a CO detector needs to be replaced, particularly if the detector doesn't include a feature to warn a user when its useful life is coming to an end. For all these reasons, it's important to be able to decode a date code.

Going all the way back to the Ademco days, Resideo products have used a date code where a letter signified the Year of manufacture, and a 3-digit number signified the day of manufacture. For example, 2022 has been signified by the letter F, so a date code of F159 would indicate a product was manufactured on the 159th day of 2022, or June 8. Calendars can be downloaded from the internet with all the days of the year enumerated.

Of course, this date code scheme has advantages and disadvantages. The letter used to signify each year can seem somewhat arbitrary, and at some point, letters must begin to be repeated. So, with a very long-lived product line, there could be some confusion as to whether a particular letter indicates the older or newer iteration of that letter for that product. The advantage of this format is that you know exactly which day a product was manufactured, and exactly which day it was packaged (packaging has its own date code, which follows the same format). This information can be helpful when determining a manufacturing issue.

Starting this month, June 2022, Resideo will standardize on a new Date Code format. In this format, containing four (4) digits, the first two (2) digits will indicate the year of manufacture, and the last two (2) digits will indicate the week of that year (YYWW). This will simplify things, as no one will have to look up or figure out which year goes with which letter, but it also doesn't supply quite as detailed an accounting of when a product was manufactured or packaged as the old format did. Packaging date codes will also be making the switch.

Below are some examples of the new Date Code, in these examples, the Date Codes are all 2223, indicating they were manufactured the 23rd week of 2022: