BFM 400 Microphones
Operating Instructions
BFM400 Operation Manual issue 7
7
2.3 DVA M
ESSAGE
S
ELECTION
OPTION
The BFM 400 Microphones include an option to broadcast DVA
Messages to either selected or all zones.
N
OTE
: This is a modification that is normally a factory fitted option.
The front panel of the microphones have extra cutouts behind the
overlay to allow extra switches to be fitted.
It is possible to select one of a range of 7 DVA messages by closing
the relevant DVA selection point to 0V.
Please refer to the following illustration for connection details.
Figure 2.3 — DVA Message Contacts and Switch Connections
N
OTE
: If using Type 0 RS485 protocol it is only possible to select DVA
Messages 1-7.
With Type 1, 2 or 3 RS485 protocol the range of the DVA messages can
be set during configuration. Refer to Section 3.4 for details.
