GSA-IM

Overview
 The GSA-IM Isolator Module is part of Kidde’s Signature Series 
system. This intelligent device enables part of the Signature data 
loop to continue operating should a short circuit occur.  The 
module can be wired into a Class A data loop at any point.

 If a fault occurs, the isolator cuts power to all devices beyond the 
isolator on the loop as follows:
 • a short on the line causes all isolators to open within 23 msec.
 • at 10 msec intervals, beginning on one side of the Class A 
circuit nearest the loop controller, the isolators close to provide 
the next isolator down the line with power.
 • when the isolator next to the short closes, it reopens within 10 msec.

 Once activated, the line fault isolator continuously checks the 
faulted side of the loop to determine if the short still exists. When 
the fault is corrected and system reset, the module automatically 
restores the entire data loop to the normal condition.
 The microprocessor in every Signature module provides at least 
three important benefits — Self-diagnostics and History Log, 
Automatic Device Mapping, and Fast, Stable Communication.

 Self-diagnostics and History Log - Each Signature Series 
module constantly runs self-checks to provide important 
maintenance information.  This information is automatically 
updated and permanently stored in the module’s non-volatile 
memory and is accessible for review any time using the  
SIGA-PRO Signature Program / Service Tool.  
 Automatic Device Mapping - The Signature loop controller 
learns keeps a map where each device’s serial number address  
is installed relative to other devices on the data circuit. 
Fast Stable Communication - Built-in intelligence means less 
information needs to be sent between the module and the loop 
controller. Other than regular supervisory polling response, the 
module only needs to communicate with the loop controller  
when it has something new to report.
 Standard Features
 • Automatic device mapping 
Each module transmits wiring information to the loop  
controller regarding its location with respect to other  
devices on the circuit.
 • Electronic addressing 
Addresses are downloaded and permanently stored  
from a PC, or the SIGA-PRO 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.
 • 2-gang mounting
 • Designed to ISO 9001 standards