Base Radio Modem
The Base Radio Modem (BRM) located at the SCADA System's base of operations is serially wired to the
System Control Computer (SCC) to provide radio communications to all remote RTU sites, to function as an optional Dialer
and as a Terminal Unit for monitoring and control of local input / output points.
The Base Radio Modem (BRM) is comprised of a radio modem board, a power supply board and a light emitting diode (LED) board
and is contained in a NEMA 4 wall mounted standard enclosure (16"x16"x10") suitable for office appearance. The above picture shows the
BRM card cage which allows for printed circuit board additions such as the optional synthesized voice telephone alarm
dialer board (left card) and the µcontroller board (right card).
The BRM's normal power is 105-135 VAC, 150 watts nominal.
In event of AC failure, all functions enclosed in the BRM enclosure including the radio operate from a 12 ampere hour
12VDC sealed lead acid rechargeable battery. The battery is maintained by a precision voltage controlled power supply.
LVMAC™ software and radio driver developed by DFA is the
communications interface between the System Control Computer (SCC) and BRM to the RTUs located at remote sites or for any
communication locally at the Base Station through the SCC's serial port.
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