September 12, 2005 • Alcorn McBride AmpTraXX User’s Manual • Rev 1.2
Page 18
Simple Serial Control
For serial communications
with a PC or an Alcorn
McBride Show Controller, use
the supplied straight-thru (not
Null) serial cable supplied
with the AmpTraXX.
The Alcorn McBride AmpTraXX may be controlled using serial RS-232C
messages via the rear DB-9 Connector. The serial data format is 38400,N,8,1:
38400 baud, 8 bits/byte, no parity, with one stop bit.
The control protocol is ASCII-based, and many commands are identical to Pioneer
Laser Disc protocol. Upper or lower case characters can be used interchangeably.
The details of these commands are listed in this section. Many other commands are
also possible and are summarized in the section entitled
Advanced Serial
Protocol
. Throughout this manual <CR> refers to a carriage return, a byte with the
hexadecimal value 0D.
Select Filter
Description:
This command causes AmpTraXX to change the audio filter of a specified channel.
Each channel can individually use 1of 6 available filters. These filters are
Flat (FL)
,
Band-pass (BP)
,
Notch (NO)
,
High-pass (HP)
,
Low-pass (LP)
, and
1KHz Test
Tone (TO)
.
Command Bytes:
ffccFI<CR>
where
ff
is the 2-letter representation of the filter type (
FL
,
BP
,
NO
,
HP
,
LP
,
NO
).
where
cc
represents the 2-digit channel number between 01
Æ
16.
Message Response:
R<CR>
Examples: Select
Flat
filter on channel 2.
FL02FI<CR>
Select
Band-pass
filter on channel 13.
BP13FI<CR>
Set Gain
Description:
This command causes AmpTraXX to change the gain level of a specified channel.
You have the choice between entering this gain level as a percentage (0%
Æ
100%)
or as a real number value between 0.0 and 10.0.
Command bytes:
nnn%ccGA<CR>
or
xx.xccGA<CR>
where
nnn%
is a percentage between 0%
Æ
100%.
where
xx.x
is real number between 0.0
Æ
10.0
where
cc
represents the 2-digit channel number between 01
Æ
16.
Message Response:
R<CR>
Examples:
Set Gain to 55% on channel 2.
55%02GA<CR>
Set Gain to 2.5 on channel 11.
2.511GA<CR>
