Extron electronic VLM 2000 - Manual (Page 34)

VoiceLift ™ Microphone • SIS Configuration and Control 3-2
SIS ™ Configuration and Control
PRELIMINAR
Y
The VoiceLift VLR 102 receiver can be controlled via a host computer that is
connected to the receiver’s RS-232 control port. You can issue Extron’s Simple
Instruction Set (SIS ™ ) commands using the computer’s RS-232 interface with a
communication software program such as HyperTerminal or Extron’s DataViewer.
SIS commands are available for you to do the following:
• Upload firmware
• Obtain information and status for VoiceLift ports and system components
• Adjust the volume for a specific channel
Protocol for the VoiceLift receiver’s RS-232 port is:
• 38400 baud
• 8 data bits
• 1 stop bit
• no parity
• no flow control
Host-to-Receiver Communications
SIS commands consist of one or more characters per field. No special characters
are required to begin or end a command sequence. When the VLR 102 determines
that a command is valid, it executes the command and sends a response to the host
device. All responses from the receiver to the host end with a carriage return and
a line feed (CR/LF = ] ), which signals the end of the response character string.
A string is one or more characters.
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).
Chn
X22* *Aud= X$
The receiver sends this message when the volume level is changed.
Copyright 2008, Extron Electronics, VLR 102, Vx.xx, 60-818-00
]
Chn X22* *Aud= X$
Vx.xx is the firmware version number.
The receiver sends the copyright and audio level messages when power is cycled to
the receiver.
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/too large)