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9VDC 500mA
AC PLUG-IN
TRANSFORMER
(PROVIDED)
COMPUTER OR AUTOMATION
SYSTEM WITH RS232 SERIAL
COMMUNICATION PORT
(NOT PROVIDED)
Installation Instructions
DO NOT
CONNECT
B- B+ A+ A-
RS-485/422
DC +9V
TXD
RXD
POWER
RS-232
RS-232 3FT CABLE
Model 8811 Protocol Adapter
CAT-5 NETWORK CABLE (NOT PROVIDED)
BLU/WHT
BLUE
ORANGE
ORG/WHT
RS-485/422 BREAKOUT
ADAPTER (PROVIDED)
DB9 RS-485 /422 CONNECTOR PIN-OUT
PIN #
RS-485/422
(PROVIDED)
APRILAIRE MODEL 8811 PROTOCOL ADAPTER
A+ A- B+ B-
APRILAIRE MODEL 8818
DISTRIBUTION PANEL
OR MODEL 8870
COMMUNICATING
THERMOSTAT
RS-485/422
DC +9V
PIN #1
1
2
3
4
5
6
7
A-
A+
B-
B+
GND NC +9V NC NC
Tx-
Tx+
Rx-
Rx+
REF REF
8
9
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Table of Contents
Summary of Contents for Aprilaire 8811
-
Page 1: Installation Instructions
RS-485/422 DC +9V PIN #1 POWER DB9 RS-485 /422 CONNECTOR PIN-OUT PIN # RS-485/422 GND NC +9V NC NC RS-232 COMPUTER OR AUTOMATION SYSTEM WITH RS232 SERIAL COMMUNICATION PORT RS-232 3FT CABLE (NOT PROVIDED) (PROVIDED) APRILAIRE MODEL 8811 PROTOCOL ADAPTER... - Page 2 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.
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