User Guide

ViewStat Programming Protocol
33
ViewStat Communicating Thermostat - Programming Protocol Reference Guide
Auxiliary Information Commands
These commands are used to request information regarding miscellaneous thermostat parameters.
Auxiliary Information Commands
Command Description
EQUIPCONFIG
Thermostat Hardware
Configuration Status
Four DIP switches are available on the thermostat circuit board, three to
configure the thermostat for type of equipment it is to be used with and one
to designate a thermostat as a "master". The position of these switches
can be read using this command. The response to this command will be
four binary values (0 or 1) with 0 indicating the switch is off and 1 indicating
the switch is on.
Syntax:
SN[address] EQUIPCONFIG?
Variables:
• wxyz = 0 or 1 depending on which configuration option is being
represented (see above).
Reply Format:
SN[address] EQUIPCONFIG=wxyz
The first of these values (w) corresponds to servant (0 or off) or master (1
or on) designation. Thermostats designated as "master" will communicate
the value of a remote sensor to which it is attached to the rest of the ther-
mostats on the network. With this feature a single remote sensor can be
used to display information such as an outdoor temperature to all the ther-
mostats on the network.
The second (x) corresponds to electric heat source (0 or off) or fossil fuel
heat source (1 or on) designation. A qualified heating and air condition
service technician should set equipment configuration switches.
The third (y) corresponds to single (0 or off) or multi-stage (1 or on) equip-
ment configuration.
The fourth (z) corresponds to heat pump (0 or off) or heat/cool (1 or on)
equipment configuration.
An example of the command sequence is as follows:
Command:
SN1 EQUIPCONFIG?
Request to the thermostat with network address 1 as to the equipment
configuration
Response:
SN1 EQUIPCONFIG = 0100
ViewStat responds that the thermostat is configured for single stage heat
pump operation with a fossil fuel heat source (i.e. dual fuel system) and
is not a "master".
BLREADY
Backlight Status
A photosensor is integrated on the thermostat circuit board to put the dis-
play backlighting (both the segmented display and the text messaging dis-
play) in a ready state. When ready, the first press of a button on the
thermostat will light the backlighting and do nothing else. This command is
used to read whether or not the backlighting of a thermostat is in the ready
state. If the corresponding change of state command has been turned on
(C12 - see Change of State command section) this information is automat-
ically sent to the host.
Syntax:
SN[address] BLREADY?
Reply Format:
SN[address] BLREADY=0 (not ready) or 1 (ready)