OPTIMOD SURROUND PROCESSOR INTRODUCTION
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dard with break points at 400 Hz and 4 kHz. It is used mainly in older stu-
dio/transmitter links that use NICAM technology.
Analog Outputs
The two analog outputs appear on XLR-type male connectors on the rear panel.
These are intended primarily for monitoring. However, their frequency response is
wide enough to limit overshoot to 1% or less, allowing these outputs to be used
feed processed audio to a transmitter or STL.
These outputs can emit many different signals as determined by the 8685’s output
routing switcher. Output impedance is 50Ω; balanced and floating. The outputs can
drive 600Ω or higher impedances, balanced or unbalanced. The peak output level is
adjustable from –6dBu to +24dBu.
Level control of the analog outputs is accomplished via software control through
System Setup (see step 4 on page 2-21 and step 10 on page 2-30) or through PC Re-
mote.
Remote Control Interface
The Remote Control Interface is a set of eight optically isolated GPI inputs on a DB-
25 connector, which can be activated by 5-12V DC. They can control various func-
tions of the 8685:
• Recall any processing Preset, Setup, Test Mode state (Bypass or Tone), or exit
from a Test Mode to the previous processing preset.
• Reset the 8685’s internal clock to the nearest hour or to midnight.
You can reconfigure the functions of the GPI inputs via System Setup. For
example, if you are not switching between stereo and mono, the inputs
ordinarily dedicated to controlling the stereo/mono status can instead be
re-configured to call additional presets.
See Remote Control Interface Programming on page 2-54 for information on pro-
gramming the GPI and step 5 on page 2-3 for wiring information.
Computer Interface
On the rear panel of the 8685 are an RS-232 serial port and an Ethernet port for in-
terfacing to IBM-compatible PCs either locally or through a TCP/IP network. The
Ethernet port supports remote control and metering, and allows downloading soft-
ware upgrades. The RS-232 port supports ASCII commands through a terminal con-
nection.
Each 8685 package ships with 8685 PC Remote software, an application for any PC
running Microsoft Windows XP (SP2 or higher) or Vista. 8685 PC Remote permits you
to adjust any 8685 preset by remote control or to do virtually anything else that you
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