Suitable Only  For Building Management Systems

Calculator Alarm System -- Provides

A confirmation of error code locally (small audible alarm on HCM4)
Despatches a voltage signal back to the BMS when in error
Vastly Improves Security 
Provides quick and convienient acknowledgement

List Of Error Codes

ERROR 1   No sensors or shorted to + 
ERROR 2   No sensors or shorted to – 
ERROR 3   Data transmission error 
ERROR 4   Wrong sensor type 
ERROR 5   Only 1 Sensor 
ERROR 6   More than 2 Sensors 


How it works 

Twisted pair is wired from the BMS 
A voltage is despatched to CAT Terminal 1 (max voltage 24 volts)
In normal format CAT Terminal 2 despatches zero volts 
When in error CAT Terminal 2 returns the same voltage as CAT 1 Terminal