If this helps bolster the info on the Powermaster-30 here is a picture of the IP connector on one S-303151(Rev.A0) which is the "newer" PowerG or PG2 series of Powermaster panels. This connector is where the Visonic PowerLink module gets plugged into.
Some time ago I connected a CP2102 USB-TTL Ver.3.0 board to the IP connector for using the Visonic panel remote/configuration software on a PC instead of doing it all through the panel's keyboard. The board just plugs into PC's USB, is powered by it, and is recognized by the Visonic software (there may have been some set up to find it, don't recall).
Ten pins, 5 top, 5 bottom, I forgot the numbering order. Visonic's connector "key notch" is facing up and not shown in photo.
Top three middle pins of the Visonic connector are connected to the CP2102 as follows, left to right:
Ground - Green wire
CO2102 Rxd ( the Visonic's Txd) - Yellow wire
CP2102 Txd (the Visonic's Rxd) - Blue wire
So in looking at @cjcharles previous postings this seems to conform; although the connector is labeled "IP" instead of RS232 : [image]
![[image]](https://community.hubitat.com/uploads/default/original/3X/8/1/81c2fbdec0a25efb88aff31b0265d8204123b1a0.jpeg){kind=link}