Dan Dugan Sound Design D-3 - Manual (Page 42)

Dugan Model D-3 User Guide Remote Control
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To use the logic outputs, we recommend using the Music System for positive action.
However, to use the logic outputs with the Speech System, the following considerations
apply:
• Since the Speech System’s logic output flickers when a person speaks, it cannot be
used directly for control. Users have successfully programmed Crestron systems to
convert the Dugan’s momentary outputs to the necessary held signals for camera
control.
• The logic output is true (low) whenever the gain of a channel is above the logic
threshold, set at the factory at -3 dB. If you are using the logic outputs, you may
need to adjust the logic thresholds (internally) depending on the number of mics in
the system. If there are only two mics in auto mode, each mic’s average gain during
ambient noise would be around -3 dB, so the logic outputs would both be true much
of the time. In this case the logic threshold should be set to -1 or -0.5 dB.
Conversely, in a system with 16 or more mics and high gain to speakers in the room,
feedback may prevent channels from coming all the way up. If the logic threshold
is set to -3 dB, it may not activate when someone speaks. This case might require
setting the logic thresholds down to -4 or -5 dB. Contact the factory to set the thresh-
old to the optimal level for your installation.
4.2 RS-232 Remote Control Commands
4.2.1 Introduction
The Model D-3 provides an RS-232 link to control the unit remotely with third-party
control systems. Every control available on the Control Panel, except the knobs, can be
accessed with the RS-232 link. The RS-232 transmission protocol is: 38400 baud, 8-bit,
no parity, and 1 stop-bit. A straight serial cable (not a null-modem cable) is required to
operate from a PC.
Two command formats are supported:
• ASCII text format extended with a binary byte at the beginning and a binary check-
sum byte at the end. The check-sum enhances the reliability of the transmission.
0xFE ID Command check-sum
0xFE means an 8-bit byte with the hexadecimal value FE, 254 in decimal, 0111
1111 in binary (sent left to right).
• ASCII text format:
ID Command
This format is appropriate for quickly testing a command from a terminal. We rec-
ommend using the extended format for highest reliability.