R M - 7 0 2 T W O - C H A N N E L R E M O T E S T A T I O N
2 - 1 8
INTERNAL IFB OPERATION
To use either channel A or B as an IFB feed, connect the program source to
the program input (as described in the previous section) and set the
Program
Interrupt A
(or B) DIP switch to the
on
position. The program will now be
interrupted whenever there is a
call
signal present on channel B. If there are
multiple RM-702s in the system, the program should only be fed into one of
the RM-702s.
To interrupt the IFB program automatically when a
talk
rather than a
call
signal is active on channels A or B, you must reset an internal jumper as
described in “Re-Setting Program Interrupt Options” earlier in this chapter.
EXTERNAL IFB (MA-704 AND PIC-4704
CONNECTION)
Clear-Com provides a stand-alone IFB system called a PIC-4704. The
PIC-4704 provides four interruptible IFB feeds from two program sources,
and is located in a central location. The MA-704 is a four-channel control
head intended to work with the PIC-4704. An MA-704 is located at each
location where program interrupt is to be initiated. Each MA-704 has its own
panel-mounted microphone which, when mounted next to an intercom station
with a panel mounted microphone, causes panel congestion with two
microphones at a single location.
The RM-702 has a 1/4 in. (0.64 cm) phone jack output on its rear panel
intended to connect directly to an MA-704 and provide a microphone feed to
the MA-704. The MA-704 can be ordered without a panel-mounted
microphone. When a button is pressed on the MA-704, a control signal will
temporarily transfer the microphone in use on the RM-702 to the MA-704,
muting any
talks
active on the RM-702.
To connect the RM-702 to an MA-704, use a two-wire shielded cable with
1/4 in. (0.64 cm) tip, ring, and sleeve jacks on each end. Connect the tip to the
tip, the ring to the ring, and use the shield to connect the sleeve to the sleeve.
Figure 2-15: Typical External IFB System Using a PIC-4704 and MA-704 with a
RM-702
Director
1/4” phone jack
Channel A
Channel B
RM-702
Stand-alone
IFB system
PGM 1
PGM 2
PIC-4704
Assistant
Director
1/4” phone jack
Power
Supply
PS-702
RM-702
To additional party line
