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A full command set and detailed explanation of the
command set is available for those who want to write their
own software. Contact Research Products Corporation at
888-782-8638 to request a copy of DP 10005756.
Upper or lower case letters may be used for all commands.
Invalid characters will immediately invalidate a command,
so the use of backspace or delete is not allowed (applies
mainly when interacting with the thermostat using
HyperTerminal).
All commands will begin with the characters
SN.
Immediately following the SN, without any intervening
spaces (blanks), will be the address
(#) from 1 to 64 of the
Model 8870 Thermostat with which you are communicating.
Single digit addresses may be sent as a two digit address
with a leading zero. Omitting the address, or using a 0 (zero)
in place of a space makes the command global, and all
connected thermostats will respond. Following this initial
command sequence, spaces may be inserted at this point
only, for clarity between commands. The next portion is the
command or variable
[Command]. The table on page 20
describes the basic commands. The next portion
[? or =]
is the action to be performed: “?” corresponds to “state your
value” while “=” corresponds to “set your value”. Spaces
are allowed between the command and the action. The final
portion,
[Value], is used only if a command or variable is
to be set. The value must follow the action with no
intervening spaces. A carriage-return is used as
the terminator for the command string. Line feeds (LF) should
not be sent with commands as this is a recognized ASCII
character and invalidates any command received between
the line feed and the next carriage return.
EXCEPTION: The command SN? or SN0? will respond with
all connected thermostats returning their address.
COMMAND RESPONSE SYNTAX
The Model 8870 will respond by supplying the information
requested or by confirming the completion of an action
command. The response syntax is generally the same as
that used for commands, but no spaces separate command,
action or value. Responses are sent in upper case ASCII
format. Should a command not be recognized, no response
will be forthcoming – there is no ERROR message.
Unless otherwise noted as “Read Only” or “Write Only”, all
commands are “Read and Write”.
Inquiries can be made with all commands (with the
exception of BLTON) 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.
APRILAIRE COMMAND SET
Appendix 2
SN# [Command] [? or =] [Value (use with = only) ] Enter
Enter
19