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7.12.2
Power Supply
The site receiver is supplied with AC mains power via the IEC connector mounted on the
PCB support bracket. This connector contains fuses rated at 1A (@220VAC). The IEC
socket is connected under the support bracket to the torroidal transformer primary. The
transformer's secondaries provide the following voltages to the site receiver and have
the associated fuses installed.
•
place, the resulting unregulated ±28V DC will light LED's L18 and L19. Used for
pan/tilt motor drive.
•
place the resulting unregulated ±12V DC will light LED's L2 and L3, and the
regulated 5V will light L1. Used to provide power for lens drive, 12V DC camera
power, and to supply the micro-controllers and associated circuits with regulated 5V.
•
Used for AC camera power.
•
supply is isolated above ground. Alternatively if a 12V DC camera is used, power is
supplied from PL1.
7.12.3
Communications
The RD379 site receiver communications are controlled by the CC-2000 micro-controller.
This section details the switch and jumper settings needed for the required mode of
communications.
Balanced Two Wire Audio
The normal connection to the site receiver is a two-wire type cable that carries AFSK
control information from a RD315 communications module. For this mode of operation
the cable is connected into PL4, and LK6 must be in position "2W". In addition LK2
must have jumpers to link "A→B" and "C→D" to link the communications processor to
the motor control processor. (Factory default).
Four Wire Audio
In some situations, a 4 wire audio connection may be more suitable. For example if an
optical fiber AF channel is being used. The receive data is an unbalanced input at PL3,
while transmit data is via balanced two-wire at PL4. Audio sing around or feedback can
be avoided using this type of connection. The receive data cable should not be wired
further than a few meters and must be shielded as it is a high impedance input. LK6
must be in position "4W". In addition, LK2 must have jumpers to link "A→B" and "C→D"
to link the communications processor to the motor control processor.
Rev. C
2 × 20V/5A via PL17 and PL18. F1 and F2 are rated at 5A. With the fuses in
2 × 10.5V/2A via PL19 and PL20. F3 and F4 are rated at 2A. With the fuses in
1 × 24V/1A via PL2. F5 is rated at 1A. With the fuse in place LED L20 will light.
The 24V used to power an AC camera is output from the board at PL2. This
CAUTION: The UNBAL-INPUT should not be wired
further than a few meters and must be shielded, as it is a
high impedance input.
7.12-2
HMXMU001018
10/06
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