3
Issue 1 Software iss BVAM8-7
Communications to Central Equipment
The Microphones as supplied are fitted with a 3 metre leads that should be terminated to Fire Proof
cabling (MICC / FP200 or similar) for connection to the Central Equipment.
It is strongly recommended that separate cables be used for the audio pair to eliminate potential
interference from the data signal.
Function
Colour
0V
Black
Speech Audio Pair
Orange
Speech Audio Pair
Yellow
+24V
Red
All Call *
Purple *
RS 485 Data pair
Green
RS 485 Data pair
Blue
EMC Ground
Screen
Not used
Brown
Not used
Pink
Not used
White
MICROPHONE SIGNAL
Balanced audio at +10dBM (2.5V) from a source impedance of 400R.
DATA SIGNAL
9600 baud half duplex RS485
Microphone capsule and signal paths are monitored using a 20KHz signal.
Data signal path is monitored using parity checking and hand shaking techniques.
Micro Controller:
PIC17C43 with watchdog restart.
Microphone Type:
Capsule 200 Ohms Dynamic noise cancelling, or
Fist mic with PTT . 1.8m coil cord
Frequency Response: 100Hz – 5kHz
Sizes:
Front Panel Size
Bezel Size
Bezel Cut-out Size
Mic Type
H
L
W
L
W
L
W
BVR16M
80mm
306mm
180mm
337mm
211mm
317mm
191mm
BVR32M
80mm
536mm
180mm
566mm
211mm
546mm
191mm
BVR48M
80mm
726mm
180mm
756mm
211mm
546mm
191mm
BVR64M
80mm
536mm
348mm
N/A
N/A
N/A
N/A
+24V
SPEECH AUDIO
DATA - RS485
ALL CALL*
0V
0V
4 CORE
2 CORE
* Emergency All Call feature only when fitted
