User manual

(4.0E) 2-3
2.5. Remote control & monitoring
The E-PAC is fitted with a remote interface for various levels of remote
control and system supervision. The remote interface connection is
opto-coupled and floating.
Basic-Remote
The Basic Remote is the simplest way to implement a remote control
system. E-PAC can be remotely powered on by simply applying an 18 -
28 VDC control voltage to the terminals of its remote interface
connector. Connecting a simple detector circuit to the remote interface
also allows remote warning of an E-PAC fault.
Details of basic circuits for remote power control and fault display are
published in d&b technical information bulletin TI 212, available on
request.
Control by the d&b Remote Interface Bridge (RIB)
The d&b RIB is a 19“ rack mount device, 1 rack unit high. Up to 12
mainframes (A1 or P1200A) or E-PACs at distances up to 500 m (1650
ft) can each be directly connected via a twin wire to a RIB I/O port.
From the front panel of the RIB each device can then be remotely
powered on and off and its power and error status monitored. A group
of E-PACs or mainframes can be switched directly by the RIB front
panel MASTER ON/OFF switch or remotely via a connection to an
opto-coupled input port on the rear panel of the RIB. Remote indication
of the error status of a mainframe group can also be relayed by the
RIB.
Computer/MIDI control
Using a PC and the d&b ROPE control software or a MIDI control
device, up to eight RIBs can be controlled via RS232, RS422 or MIDI
interface. With an E-PAC the following remote control and display
options become available:
Remote control
− Power On/Off
− Level control from +6 to –57.5 dB in 0.5 dB steps
− MUTE switching
− Standby switching
− Configuration switching (CUT, HFA, SPEAKER, LO IMP, DELAY ON)
− Delay time up to 170 ms in 0.1 ms steps
Remote status information
− Configuration switch status (all rear panel DIP switches)
− Mute/Standby switch status
− Level control setting
− Front panel indicator status (ISP, GR, ERR)
− Protect status (internal protect, short circuit protect, thermal protect)
− Temperature status (ok/warning/off)
− Available headroom (pre-limiter)
− Gain reduction (due to limiter operation)