Can I Change The Honeywell Vista 21iP’s Prom Chip?

Unlike the Honeywell Vista 15P and Vista 20P, at this time Honeywell does not offer a prom chip for the Vista 21iP control panel.

The main reason users replace the prom chip in the Vista 15P and Vista 20P is to be compatible and upgrade to a 4G gsm cellular communicator and to be able to connect to Total Connect 2.0.

As most alarm users are aware, 2G sunset will be completed by December 2016. This means 2G cellular units need to be upgraded to either a 3G or 4G cellular communicator so service is not interrupted.

If the Vista 21iP control panel is older and has a revision of 3.13 or below, the control panel will not be compatible with the intended Vista-GSM4G cell communicator. However, users can pair it with a Honeywell GSMV4G cellular communicator or a iGSMV4G dual communicator. The GSMV4G and the iGSMV4G are compatible with any revision of the Vista 21iP control panel,so it is not necessary to replace the prom chip or the entire control panel.

The Vista-GSM4G is designed to be installed directly inside the Vista 21iP control panel. Where as the GSMV4G and the iGSMV4G are units that will be installed outside the control panel. When installing either the GSMV4G or the iGSMV4g, the wiring is exactly the same for both but you will need to connect an Ethernet cable on the RJ-45 port on the iGSMV4G to your router. require a 4 wire connection to the panel's ECP bus which is located on terminals 4-7 on the VISTA-21iP. There is a power connection on terminals 4 and 5 on the Vista 21iP control  panel and a data connection on terminals 6 and 7 on the panel. Although the communicator is already connected to ECP power, it still requires an AC power connection on terminals 1 and 2 of the communicator. The GSMV4G and iGSMV4G include a Honeywell 1361 AC transformer. Users can wire the cell communicator directly to the 1361 transformer or a shared transformer can be used with the panel. Swap the wired connections over to the new transformer. Then land terminals 1 and 2 from the cell communicator to terminals 1 and 2 on the Vista 21iP panel in parallel, right on top of the existing connections to the transformer. 

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