Model 8811 Protocol Adapter
Installation Instructions
RS-232
POWER
RXD
TXD
RS-485/422
DC +9V
A-
A+
B+
B-
A+
A-
B+
B-
REF
REF
B-
B+
A+
A-
BLU/WHT
BLUE
ORANGE
ORG/WHT
RS-485/422
DC +9V
PIN #1
DO NOT
CONNECT
PIN # 1 2 3 4 5 6 7 8 9
RS-485/422
A-
Tx-
A+
Tx+
B-
Rx-
B+
Rx+
GND NC +9V NC NC
DB9 RS-485 /422 CONNECTOR PIN-OUT
9VDC 500mA
AC PLUG-IN
TRANSFORMER
(PROVIDED)
CAT-5 NETWORK CABLE (NOT PROVIDED)
APRILAIRE MODEL 8818
DISTRIBUTION PANEL
OR MODEL 8870
COMMUNICATING
THERMOSTAT
RS-485/422 BREAKOUT
ADAPTER (PROVIDED)
RS-232 3FT CABLE
(PROVIDED)
COMPUTER OR AUTOMATION
SYSTEM WITH RS232 SERIAL
COMMUNICATION PORT
(NOT PROVIDED)
APRILAIRE MODEL 8811 PROTOCOL ADAPTER
RESEARCH PRODUCTS CORPORATION
P.O. BOX 1467 • MADISON, WI 53701-1467 • PHONE: 888/782-8638 • FAX: 608/257-4357 • www.aprilairepartners.com
61000601 8.08
B2204661A
APRILAIRE COMMAND DESCRIPTION
APRILAIRE COMMAND SET
©2008 Research Products Corporation
Printed in U.S.A.
A full command set and a detailed explanation of the command set is available for those who want to write their own software.
Contact Aprilaire to request a copy.
SN# [Command] [? or =] [Value (use with = only)]
Enter
All Aprilaire commands will begin with the characters
SN
. Immediately following the
SN
, without any intervening spaces
(blanks), will be the address
(#)
of the Aprilaire Thermostat with which you are communicating. Omitting the address makes
the command global, and all connected communication cards will respond. Following this initial command sequence, spaces may
be inserted for clarity between commands. The next portion is the command or variable
[Command]
. The table below
describes the available commands (refer to the Aprilaire Automation System Installation Manual for a detailed description of the
command set). The next portion
[? or =]
is the action to be performed:
?
corresponds to “state your value”,
=
corresponds
to “set your value”. The final portion,
[Value]
, is used only if a command or variable is to be set. A carriage return
Enter
is used as the terminator for the command string.
EXCEPTION: The command
SN?
will respond with all connected thermostats returning their address.
Upon receipt of a proper command, Aprilaire will act on it and respond appropriately. Any command sent that is not understood
will be ignored – there is no ‘ERROR’ message sent back. Some of the available commands are summarized in the following list.
COMMAND DESCRIPTION VALUE
HOLD User Hold/Network Override State ON / OFF
NAME Location Name <String>
CR Command Response Control Silent / Quiet / Normal
SCALE Command Temperature Scale F / C (Fahrenheit/Celsius)
ID Report Thermostat Device Type ?
MODE,M Thermostat Mode of Operation A / C / H / E / OFF (Auto/Cool/Heat/EMHT/Off)
TEMP, T Report Thermostat Temperature Inquiry Only
REMOTE, R Report Thermostat Remote Temperature Inquiry Only
HVAC, H Report HVAC Relay States Inquiry Only
FAN, F Fan Switch Setting A / ON (Auto/On)
SET POINT, S Current Mode Set Point Two or three digit integer (see next two commands)
SETPOINTHEAT, SH Heat Mode Set Point Two digit integer (40 – 88)
SETPOINTCOOL, SC Cool Mode Set Point Two or three digit integer (42 – 90)
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1
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2
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