User Guide

ViewStat Programming Protocol
10
ViewStat Communicating Thermostat - Programming Protocol Reference Guide
Communication Control Commands
The following commands control how the ViewStat will communicate.
The following command descriptions describe the use of the command when setting a particular
variable. Inquiries can be made with all commands (with the exception of the
SCUP, SCDN, BLTON
and
ENTR commands) to determine the existing value of a variable. Inquiry is done using the
following syntax:
SN [address number, or <blank> or 0 (zero) for global] "COMMAND" ?
where COMMAND is the variable whose value is desired.
Communication Control Commands
Command Description
CR
Command Response Control
The ViewStat normally responds to all commands. All responses begin with the
string SNx where x is the ViewStat network address number (address range =
1-64). All responses are concluded with a carriage return. The Command
Response Control command allows you to change the response actions.
Syntax:
"'SN<address> CR=<mode>'"
Variables:
• <address> = 0 (all thermostats), or 1 through 64 (thermostat-specific
address)
• <mode> = S, N, Q
S (SILENT) - Viewstat will not reply to any command. Action commands
(telling ViewStat to change a setting) will be acted upon, but no response will
be returned indicating that the action was performed. All inquiry commands
(asking ViewStat for information) will be ignored. COS commands will be
received by ViewStat, but ViewStat will not act upon those commands while in
the silent mode.
N (NORMAL) - sets the ViewStat to the default mode where a response is
always given.
Q (QUIET) - Viewstat will not reply to action commands. Inquiry commands
will be responded to. This suppresses the feedback response on action
commands. COS commands will be heard and carried out.
Example 1 - Silent mode
• Command Format:
SN[address] CR=S or SILENT
• Reply Format: No response will be received.
Example 2 - Normal mode
• Command Format:
SN[address] CR= N or NORMAL
• Reply Format:
SN[address number] CR=NORMAL
Example 3 - Quiet mode
• Command Format:
SN[address] CR= Q or QUIET
• Reply Format: No response will be received.
(Cont.)