GSA-CT2

Overview
 The GSA-CT1 Single Input Module, GSA-CT1HT High 
Temperature Single Input Module and GSA-CT2/GSA-MCT2 Dual 
Input Modules are intelligent analog addressable devices used to 
connect one or two Class B normally-open Alarm, Supervisory, or 
Monitor type dry contact Initiating Device Circuits (IDC).

 The actual function of these modules is determined by the 
“personality code” selected by the installer. This code is downloaded 
to the module from the Signature loop controller during system 
configuration.

 The input modules gather analog information from the initiating 
devices connected to them and convert it into digital signals. 
The module’s on-board microprocessor analyzes the signal and 
decides whether or not to input an alarm.

 The GSA-CT1, GSA-CT1HT and GSA-CT2 mount to standard 
North American 1-gang electrical boxes, making them ideal for 
locations where only one module is required. Separate I/O and 
data loop connections are made to each module.

 The GSA-CT1HT module operates at an expanded temperature 
range of 32 ºF to 158 ºF (0 ºC  to 70 ºC) for those applications 
requiring more extreme environmental temperature variation.

Standard Features
• Multiple applications 
 Including Alarm, Alarm with delayed latching (retard) for 
waterflow applications, Supervisory, and Monitor. The installer 
selects one of four “personality codes” to be downloaded to 
the module through the loop controller.
• GSA-CT1HT rated for high temperature environments  
Suitable for attic installation and monitoring high temperature 
heat detectors. 
• Plug-in (UIO) or standard 1-gang mount 
UIO versions allow quick installation where multiple modules 
are required. The 1-gang mount version is ideal for remote 
locations that require a single module.
• Automatic device mapping 
Signature modules transmit information to the loop controller 
regarding their circuit locations with respect to other Signature 
devices on the wire loop.
• Electronic addressing 
Programmable addresses are downloaded from the loop 
controller, a PC, or the Signature Program/Service Tool.  
There are no switches or dials to set. 
• Ground fault detection by address 
Detects ground faults right down to the device level.