BDM 400 Microphones
Operating Instructions
BDM400 Operation Manual issue 10
7
2.3 DVA M
ESSAGE
S
ELECTION
OPTION
The BDM 400 Microphones include an option to broadcast DVA
Messages to either selected or all zones.
The top panel of the microphones have extra cutouts behind the
overlay to allow extra switches to be fitted.
The BDM401, 404 and 408 microphones have three cutouts and
the BDM416 has seven.
It is possible to select one of a range of 8 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
: This is a modification that is normally a factory fitted option.
C
AUTION
It is important to ensure switch terminals do not short out on the
chassis due to the limited height within the body of the
microphone.
If required, please contact our Technical Sales department for
details of suitable switches.
Note: 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.
