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Programmer's Guide, cont'd
Innn Audxx
The switcher initiates the Aud message when a front panel input audio level change
has occurred. nn is the input number and xx is the dB level.
Outnn Volxx
The switcher initiates the Vol message when a front panel output audio volume
change has occurred. nn is the output number and xx is the volume level.
Amtnn*x
The switcher initiates the Amt message when an audio output mute is toggled
on or off from the front panel. nn is the output number and x is the mute status:
1 = on, 0 = off.
Exen
The switcher initiates the Exe message when executive mode is toggled on or off
from the front panel. n is the executive mode: 0, 1, or 2.
Switcher Error Responses
When the switcher receives an SIS command and determines that it is valid, it
performs the command and sends a response to the host device. If the switcher
is unable to perform the command because the command is invalid or contains
invalid parameters, the switcher returns an error response to the host. The error
response codes are:
E01 — Invalid input channel number (too large)
E10 — Invalid command
E11 — Invalid preset number
E12 — Invalid output number (too large)
E13 — Invalid value (out of range)
E14 — Illegal command for this configuration
E17 — Timeout (caused only by direct write of global presets)
E22 — Busy
Using the Command/Response Tables
The command/response table begins on page 4-6. Lower-case letters are acceptable
in the command field except where indicated for the gain and attenuation
commands. The table below shows the hexadecimal equivalent of each ASCII
character used in the command/response table.
ASCII to HEX Conversion Table
Space
Symbols are used throughout the table to represent variables in the command/
response fields. Command and response examples are shown throughout the table.
4-4
MTPX Twisted Pair Matrix Switchers • Programmer's Guide
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