AMX ENV-VST-C - Manual (Page 31)

Programming
25 ViewStat Color Communicating Thermostat
AxLink Channels
Each AXLink device contains 255 channels numbered 1-255. The AxLink Channels for the thermostat
are defined in the table below. The Type column indicates who initiates the channel change. The Master
directs the thermostat to change its state through channels with type CMD. The thermostat informs the
Master of state changes through channels with type FDBK. Some channels can be used for both CMD
and FDBK.
AxLink Commands (Cont.)
?SERIAL
Retrieves the
16-byte serial
number set on the
thermostat.
The Master sends the ?SERIAL command to request the thermostat’s serial number.
Syntax:
?SERIAL
Example:
SEND_COMMAND ’?SERIAL’
The Master requesting the thermostat’s serial number.
SEND_COMMAND ’SERIAL 1234567890123456’
The thermostat returns the serial number 1234567890123456.
SP
Sets or changes
the humidify and
dehumidify set
points.
Syntax:
SP H D
Variable:
HSP = The new humidify setpoint with a range of 0 to 100.
DSP = The new dehumidify setpoint with a range of 0 to 100.
Example:
SEND_COMMAND ’SP H75 D20’
Sets the humidify setpoint to 75% and the dehumidify setpoint to 20% RH.
ST
Queries for the
thermostat system
configuration.
When received the thermostat reports its configured humidify and dehumidify set points,
thermostat mode, and temperature scale.
Syntax:
SEND_COMMAND ’ST’
AxLink Channels
Channel Type Function Description
1-138 Not Used
139 CMD Weather Alert A Weather Alert is active while the channel is
ON. To clear an active Weather Alert set the
channel to OFF.
140 CMD Increment Cool Set Point Increases the cool set point by one step per
pulse while the channel is active (ON).
141 CMD Decrement Cool Set Point Decreases the cool set point by one step per
pulse while the channel is active (ON).
142 Not Used
143 CMD Increment Heat Set Point Increases the heat set point by one step per
pulse while the channel is active (ON).
144 CMD Decrement Heat Set Point Decreases the heat set point by one step per
pulse while the channel is active (ON).
145-147 Not Used
148 CMD Increment Humidify Set
Point Continue to increment the humidify set point
while the channel is active, ON, as if the
increment button were being pushed.