6-8
TECHNICAL DATA
in the boot process to reload DSP program code into them. At this point, the audio
will mute for about 2 seconds until the DSP code download has finished. If you hear
a 2-second audio mute on air, you can assume that the 8600 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 board, which plugs into the base board and which contains
the CPU, the Ethernet interface chip, the flash memory, the DRAM, and the real-time
clock, which keeps time for the 8600’s automation functions. The real-time clock is
backed up by a DL2032 battery so that it keeps accurate time even when the 8600 is
powered down. The battery is socketed and can be readily accessed by removing the
8600’s top cover; the battery is located on the foil (top) side of the CPU board.
User Control Interface and LCD Display Circuits
The user control interface enables the user to control the 8600’s functionality. A rear
panel GPI connector allows optically isolated remote control of certain functions,
such as recalling presets, via contact closure. An Ethernet port and three RS-232 seri-
al connectors allow you to connect a modem or computer to the 8600. Front panel
pushbutton switches select between various operational modes and functions. A ro-
tary encoder allows the user to adjust parameters and enter data.
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 8600 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 8600 will respond to the most recent control oper-
ation, 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
field-repairable.
Color LCD Display
The 5.7” color LCD is an active-matrix quarter-VGA panel. The CPU addresses its con-
troller chip through the CPU’s ISA bus.
Содержание OPTIMOD-FM 8600
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