Orban OPTIMOD 8685, Руководство по эксплуатации

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TECHNICAL DATA ORBAN MODEL 8685
will mute for about two seconds until the DSP code download has finished. If you
hear a two-second audio mute on air, you can assume that the 8685 has rebooted
for some reason. Be prepared to convey this fact to Orban customer service if you
call for technical assistance.
The control board is divided into two assemblies: a “base board,” which has inter-
face circuitry, and a “CPU controller module,” which plugs into the base board and
which contains the CPU, the Ethernet interface chip, the flash memory, the DRAM,
the LCD graphics controller, and the real-time clock, which keeps time for the 8685’s
automation functions.
The real-time clock is backed up by a DL2032 battery so that it keeps accurate time
even when the 8685 is powered down. Expected battery life is about three months
when the 8685 is not powered up and many years when the 8685 is powered. The
battery is socketed and can be readily accessed by removing the 8685’s top cover;
the battery is located on the foil (top) side of the CPU controller module.
User Control Interface and LCD Display Circuits
The user control interface enables the user to control the 8685’s functionality. A rear
panel GPI connector allows optically isolated remote control of certain functions,
like recalling presets, via contact closure. An Ethernet port and an RS-232 serial con-
nector allow you to connect a modem or computer to the 8685. Two RS-485 serial
connectors (labeled
S
ERIAL
P
ORT
2 and S
ERIAL
P
ORT
3 ) allow the 8685 to send and re-
ceive Dolby-E (SMPTE RDD 6-2008) metadata. Front panel pushbutton switches select
between various operational modes and functions. A rotary encoder allows the user
to adjust parameters and enter data.
1. Remote Interface and RS-232 Interfaces
Located on base board
A remote interface connector and circuitry implements remote control of certain
operating modes; OPTIMOD-FM 8685 has eight remote contact closure inputs.
A valid remote signal is a momentary pulse of current flowing through remote
signal pins. Current must flow consistently for 50msec for the signal to be inter-
preted as valid. Generally, the 8685 will respond to the most recent control op-
eration, regardless of whether it came from the front panel, remote interface, or
RS-232.
Component-Level Description:
After being current-limited by resistors, the GPI control signals are applied to
two quad optoisolators, U10, 12, and then to the control circuitry.
Octal driver U1 buffers the RS-232 port, which is located on a small daughter
board.
U10, 12 and U1 are socketed for easy field replacement in the event of over-
load, lightning damage, etc. All other circuitry is surface-mount and is not