6/11
Quick Start Guide
Control I/O
To download the latest version of SymNet Designer, the Windows application that
controls all SymNet hardware, go to: www.symetrixaudio.com
SymNet
TM
Audio Matrix
7/11
Quick Start Guide
Control I/O
To download the latest version of SymNet Designer, the Windows application that
controls all SymNet hardware, go to: www.symetrixaudio.com
SymNet
TM
Audio Matrix
(RI) Read Input State
Reads the state of the analog control inputs.
Command:
RI <address> <input><cr>
Where
<input>
is a decimal number
1-8
.
Response:
<value> <ACK/NAK><cr>
If the input is a pot,
<value>
is always returned as 3 decimal digits with a range of
000-255
.
000
= pot arm at ground
255
= pot arm at max
If the input is an encoder,
<value>
is always returned as 3 decimal digits with a range of
000-255
. The step size is assumed
as 1. Encoder range can be limited with the
EN
and
EX
commands. When used as encoder inputs, the analog control inputs
feature a built in acceleration function to speed large changes.
If the input is a dual switch,
<value>
is:
000
= No switches on
001
= Lower (A) switch on
010
= Upper (B) switch on
011
= Both switches on
Note:
If
<input>
is outside the
1-8
range, a
NAK
is returned along with a
<value>
of
0
. If the port mode wasn’t previously
set up, a “
NAK
” is returned along with a
<value>
of
0
.
(SO) Set Open Collector Initial Value
Allows the powerup value of the open collectors to be set. This is useful for initializing the open collector outputs to a given state
on powerup.
Command:
SO <address> <output> <state><cr>
Where
<output>
is a decimal number
1-8
and
<state>
is
0
for off and
1
or greater for on. When the open collector is off,
the voltage at the open collector is pulled high to 5 volts allowing an attached LED to light. When the open collector driver is on,
there is a low impedance between the output and ground connections allowing an external load to sink current.
Response:
<ACK/NAK><cr>
If
<value>
is greater than
255
or
<input>
is outside the
1-8
range, a “
NAK
” is returned. This value is saved and restored
on powerup.
(OC) Open Collector Output Control
Turns open collector outputs on (active low) or off (tristate, normally pulled high). These outputs first initialize to off (high),
however this initial state can be changed with the
Set Open Collector Initial Value
command.
Command:
OC <address> <output> <state><cr>
Where
<output>
is a decimal number
1-8
and
<state>
is
0
for off and
1
or greater for on. When the open collector is off,
the voltage at the open collector is pulled high to 5 volts allowing an attached LED to light. When the open collector driver is on,
there is a low impedance between the output and ground connections allowing an external load to sink current.
Response:
<ACK/NAK><cr>
ASCII Control Protocol... continued
Summary of Contents for SymNet Audio Matrix Control I/O
Page 10: ......
