Symetrix Airtools Control I/O Quick Start Manual page 7

Quick Start Guide
Control I/O
ASCII Control Protocol... continued
(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>
To download the latest version of Studio Matrix Designer, the Windows application
that controls all Studio Matrix hardware, go to: www.airtoolsaudio.com
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