Guard Phone Module; Figure 38 Rs-485 Add-On Module - Mircom TX3 Series Installation And Operation Manual

The module has an RS-485 connector as shown in figure 38.
Figure 38. RS-485 Add-on Module
For a description on how to install the RS-485 Add-on Module see the USB to
RS-485 Adapter Installation Instructions LT-6027.
Note:
4.7

Guard Phone Module

The TX3-GPM Guard Phone Module mounts above the TX3 Lobby Control
Unit main board on the top left hand side. See figure 27.
Note:
The module has two connectors, an RJ-11 connector and a ribbon cable as shown
in figure 39.
62 TX3 Telephone Access System Installation and Operation Manual
LT-969 Copyright 2019
RS-485 Add-on
Module
Table 1: RS-485 Add-on Jumper Settings
Mode
No termination
AC termination 120R + 1nF
No termination
DC termination 120R (Factory Default)
For the main application of the RS-485 Add-on Module, JW1 and
JW2 should both be shorted.
The Guard Phone Module works only on NSL systems.
Lobby Control Unit Setup
JW1 JW2
Open Open
Short Open
Open Short
Short Short
Version 5.4