Aprilaire 8800 User Manual

Model 8800 Communicating Thermostat
Model 8800 Communicating Thermostat
Programmer’s Manual
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TABLE OF CONTENTS
Introduction............................................. 1
Protocol ................................................ 1
System Interface ........................................ 2
Timing and Synchronization .............................. 2
Host Message Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Response Expected ...................................... 3
No Response Expected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Node Message Types .................................... 3
Explicit Address Command Response ....................... 4
Global Address Command Response ........................ 4
Unsolicited Message.....................................4
Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Host Command Syntax ................................... 5
Node Message Syntax ................................... 5
Commands Table of Contents ............................. 6
Command Details........................................ 8
Thermostat Configuration Commands ....................... 8
Communication Control Commands . . . . . . . . . . . . . . . . . . . . . . . . 15
Change of State Report Control Commands ................. 18
Setup Commands ...................................... 20
Alarm Commands ...................................... 25
Lockout Commands ..................................... 27
Sensor Commands......................................31
Temperature Control Commands .......................... 36
Humidity Control Commands ............................. 44
Program and Schedule Commands......................... 46
Status Commands ...................................... 52
Messaging Commands .................................. 55
INTRODUCTION
This document contains information needed to write interface code for the Aprilaire Model 8800 Communicating Thermostat. For wiring and
thermostat setup refer to the 8800 System Installation Manual (RPC part no. 10009416).
PROTOCOL
The proprietary ASCII protocol is for communication between a Host controller and up to 64 Model 8800 Communicating Thermostats. The
protocol is based upon the Model 8870 Communicating Thermostat protocol, but has an expanded command set to utilize the additional features
of the Model 8800 Communicating Thermostat.
1

Aprilaire 8800 Specifications

Thermal Specifications

control temperature range	45º to 99ºF (7º to 32ºC)
display temperature range	32º to 99ºF (0º to 40ºC)
accuracy	± 1ºF (± .5ºC)

Operating Environment

storage temperature	-30º to 140ºF (-34.4º to 60ºC)
operating humidity	5% to 90% relative humidity
operating ambient temperature	32º to 120ºF (0º to 48.9ºC)

Electrical Specifications

voltage AC	24 VAC (18-30 VAC)
maximum load per terminal	1 amp
total maximum load	2.5 amp

Screen

screen size	10.3 sq. in.
backlit	constant low intensity light option
font size	large

Weight and Dimensions

height	4 15/16 inches
width	6 inches
depth	1 5/16 inches