VoiceLift System • SIS Configuration and Control
29
Receiver-initiated messages
When a local event such as a volume adjustment takes place, the VLR 102 responds
by sending a message to the host. No response is required from the host. The
receiver-initiated messages are listed below (underlined). The receiver sends the copyright
and audio level messages when power is cycled to the receiver.
Copyright 2011, Extron Electronics, VLR 102, Vx.xx, 60-938-01
]
Chn
X22*
*Aud=
X$
V
x
.
xx
is the firmware version number.
The receiver sends the following message when the volume level is changed:
Chn
X22*
*Aud=
X$
Additional messages may be sent by the VLR 102 in response to changes in the contact
closure input state, relay state, or microphone channel selection.
Error response
When the VLR 102 receives a valid SIS command, it executes the command and sends a
response to the host device. If the receiver is unable to execute the command because the
command is invalid or contains invalid parameters, it returns the following error response
to the host:
E13
– Invalid value (the number is out of range)
Timeout
A pause of 10 seconds or longer between command characters results in a timeout. The
command operation is aborted with no other indication.
Commands and Responses
Using the Command/Response Table
The command/response table lists valid ASCII command codes, the receiver responses
to the host, and a description of the command’s function or the results of executing
the command. The ASCII to HEX conversion table below is for use with the command/
response table:
ASCII to Hex Conversion Table
•
Space
Upper- and lowercase characters may be used interchangeably in the command field
unless otherwise specified.