BFM 400 Microphones
Operating Instructions
8
BFM400 Operation Manual issue 7
2.4 P
ROCESSOR
B
YPASS
“A
LL
C
ALL
”
OPTION
It is possible to add an extra hard wired “All Call” processor
bypass access switch to the BFM microphones to enable
broadcasts in the unlikely event that the router suffers from a
processor fault or RS485 network failure.
N
OTE
: This is a modification that is normally a factory fitted option.
N
OTE
: The BFM01 can be configured to work in Parallel mode to access
an "All Call" bypass input without adding an extra switch.
N
OTE
: The BFM microphone must be connected to the correct input on
the BVRD2M for the processor bypass to operate.
The bypass switch should be connected between JP8 & JP9, a
solder bridge should be made across LK3, and LK4 should be
carefully drilled out as shown in Figure 2.4.
Figure 2.4 — Connections required for Processor Bypass “All Call” switch
N
OTE
: The Access Level must be set via JP4 to either 3V3 or 10V which
must match the Access Level for the Bypass or CI Input that it is connected
to. For further information refer to Figure 2.2.
