16
RS-232 CONTROL
The SPM723 has an RS-232 Serial Port, which allows it to be controlled by a computer (see Front & Rear Panel Features on pg. 2). In
addition to the BiampWin software, the SPM723 offers two other methods of computer control.
Control Button Emulation:
This method allows the computer to imitate the operation of an infrared transmitter or wall-mount control
panel. Although the SPM723 does not accept infrared or wall-mount remote controls itself, it can still receive ASCII characters (via RS-
232) which emulate the buttons on these types of remote controls. From the factory, remote control buttons have equivalent ASCII
characters permanently assigned to them (see table below). Therefore, actions can be assigned to remote control buttons in the same
way they are assigned to Logic Inputs. Then, using this method, the computer can output ASCII characters which are equivalent to the
commands generated by those standard remote control buttons. Control Button Emulation allows the computer to utilize up to forty button
definitions (unlike standard remote controls, which have only twenty-eight buttons).
Advanced Computer Control:
This method provides advanced commands, which allow the computer to retrieve or edit various SPM723
settings. The computer may also emulate control buttons. Using this method, the computer may designate up to sixty-four devices, and
may also provide ‘real-time’ display of various settings.
This manual only describes the Control Button Emulation method of computer control. For details regarding Advanced Computer Control,
please download the SPM723 Computer Control manual (723host.PDF) from the ‘resources’ page of our web site (www.biamp.com).
Each control button on an infrared transmitter or wall-mount control panel corresponds to one character in the standard ASCII character
set. The character equivalents are summarized in the following table. This table includes all forty possible buttons, their button numbers,
their ASCII code equivalents, and their factory default button definitions (no operation assigned).
button 01
B no operation assigned
button 15
P no operation assigned
button 29
^ no operation assigned
button 02
C no operation assigned
button 16
Q no operation assigned
button 30
_ no operation assigned
button 03
D no operation assigned
button 17
R no operation assigned
button 31
'
no operation assigned
button 04
E no operation assigned
button 18
S no operation assigned
button 32
b no operation assigned
button 05
F no operation assigned
button 19
T no operation assigned
button 33
c no operation assigned
button 06
G no operation assigned
button 20
U no operation assigned
button 34
d no operation assigned
button 07
H no operation assigned
button 21
V no operation assigned
button 35
e no operation assigned
button 08
I
no operation assigned
button 22 W no operation assigned
button 36
f
no operation assigned
button 09
J no operation assigned
button 23
X no operation assigned
button 37
g no operation assigned
button 10
K no operation assigned
button 24
Y no operation assigned
button 38
h no operation assigned
button 11
L no operation assigned
button 25
Z no operation assigned
button 39
i
no operation assigned
button 12
M no operation assigned
button 26
[
no operation assigned
button 40
j
no operation assigned
button 13
N no operation assigned
button 27
\
no operation assigned
button 14
O no operation assigned
button 28
]
no operation assigned
The computer can initiate any functions or actions that a standard control can, by simply transmitting the equivalent control button ASCII
character. When interfacing the SPM723 to a computer, the computer must be aware that the SPM723 will ‘echo’ all characters it receives
(both from computer and Logic Inputs) via the Serial Port Transmit Data (TXD) output signal. However, from the factory, the SPM723
Logic inputs are programmed with no ‘echo character’ assigned to them.