LTEM PA/PV - Wiring to Share Panel Power

In this video, Griffin from Alarm Grid shows the viewer how to wire the LTEM-PA or LTEM-PV so that it gets all its power from the alarm panel. This will prevent the need to use two separate large and bulky transformers. One to power the panel and one to power the communicator. Instead, a single transformer is used to power both. Before you begin, be sure both the panel and the communicator are completely powered down.

If you will be replacing an older GSMX4G or CDMAX, then you should have a wiring harness connecting the existing communicator to the alarm panel. You can use this same harness with the LTEM-P Series communicator. It will plug into the port to the left of the terminal block on the LTEM-PA or LTEM-PV. The harness will only connect to the port in the correct orientation, so no need to worry that you'll connect it wrong. If you don't have a wiring harness, simply make your connections with a 4-conductor piece of wire to the screw terminals.

At the communicator terminal block, connect the Black wire to GND, connect the Red wire to +9V, Connect the Green wire to T (Tx), and connect the Yellow or White wire to R (Rx). If mounting the communicator at the top of the can, thread the wires through the threaded wiring access at the lower left of the communicator. If not, be sure to route the wires through one of the wire access holes so that the cover can attach tightly to the communicator.

Once the wire is properly routed, turn your attention to the connections at the panel. In this video, we show the connections for a VISTA-21iP, which are the same for a VISTA-20P and a VISTA-15P. If you are connecting to a VISTA-128BPT or a VISTA-250BPT, refer to the FAQ associated with this video, linked at the bottom, to verify the proper terminals to use. On the VISTA-21iP and similar panels, connect Black to Terminal 4, Red to Terminal 5, Green to Terminal 6, and Yellow to Terminal 7.

With the connections made, you're ready to power the system back up. Connect the panel's AC power, then its battery. You can choose to connect the communicator's battery as well, but if you do, it will draw slightly more current from the panel. There may be advantages to doing this though, as explained in the FAQ that accompanies this video.

https://www.alarmgrid.com/faq/how-do-i-wire-the-ltem-pa-or-ltem-pv-to-share-panel-power

http://alrm.gd/get-monitored