User guide

VoiceLift System with PVS 405D • SIS Configuration and Control 26

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.

]

Chn

X22*

* Aud =

]

Vn.nn is the firmware version number,

X22#

is the microphone channel (A, B, C, or D), and

is the volume level.

The receiver also sends this message when the volume level is changed:

Chn

X22*

* Aud=

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 and Response Table

The Command and Response Table for SIS Commands, starting on page 27, lists

valid ASCII command codes, the receiver responses to the host, and a description of the

command function or the results of executing the command. The ASCII to hexadecimal

conversion table below is for use with the command and response table:

ASCII to Hex Conversion Table

•

Space

Upper- and lowercase characters can be used interchangeably in the command field

unless otherwise specified.