Upgrading the VISTA 15P is very simple, though not always necessary. If you have an older VISTA 15P, and you want to add Total Connect 2.0 to it, you will want to take a look at the chip right in the middle of the panel. It needs to have version 9.12 or higher in order to be compatible with the Total Connect 2.0 service. It will read out WA15-9.12 if it is revision 9.12. Honeywell is constantly releasing newer systems so you could have a newer panel that is WA15P-10.23 for example.
If your panel is between revision 2.0 and 9.12, upgrading the panel is simple. This PROM chip is all you need. If your panel is older than revision 2.0 you will need to swap in a new system since those earlier revisions do not support prom chip swaps. Generally the PROM chips require that end-users purchase a communicator kit. Alarm Grid has made it possible to purchase the upgrade chip itself as a convenience to those who need to upgrade their panels but do not want to purchase a new communicator. Without this PROM chip, the only other way to upgrade the panel, is to purchase a new VISTA-15P. If you go that route, you will need to map over all of your control panel wiring and completely reprogram your system. The PROM chip upgrade does not require a system reprogram and will not affect any of your zone programming or user codes.
That said, if your old panel has no communicator, and uses a phone line, it may be worth considering the purchase of an AlarmNet communicator kit. Alarm Grid recommends the checking out the iGSMV4G-TC2 kit. If you AT&T service is not optimal in your area you can install the CDMA-X-TC2 kit.
Note: This product is for the latest version of the VISTA-15P PROM Chip. Even though the picture shows 9.12, you will receive the latest version.