2
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk
levels or to important information concerning the product.
DANGER
indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
CAUTION
used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property
damage.
FOREWORD
This manual provides guidelines for the use and installation of the Modbus communication system with HTP appliances.
FOR THE INSTALLER
The installer should be guided by the instructions furnished with the Modbus, local codes and utility company requirements. Preference
should be given to codes and requirements where they differ from the furnished instructions.
Additional publications which should guide the installer include:
The latest version of the National Electrical Code, NFPA No. 70.
In Canada, refer to Canadian Electrical Code C 22.1, from Canadian Standards Association, 5060 Spectrum Way, Suite 100,
Mississauga, Ontario, Canada L4W 5N6.
TABLE OF CONTENTS
PART 1 - GENERAL INFORMATION .......................................................................................................................................... 3
A. WHAT’S IN THE BOX ................................................................................................................................................................. 4
B. MINIMUM SYSTEM REQUIREMENTS ...................................................................................................................................... 4
C. DEFINITIONS ............................................................................................................................................................................. 4
PART 2 - INSTALLATION ........................................................................................................................................................... 5
A. WIRING REQUIREMENTS ........................................................................................................................................................ 5
B. JUMPER SETTING .................................................................................................................................................................... 6
PART 3
– COMMUNICATION CONFIGURATION (APPLIANCES WITH A 3 CHARACTER RED LED DISPLAY) .................. 7
A. MODBUS ENABLE ..................................................................................................................................................................... 7
B. MODBUS ADDRESS .................................................................................................................................................................. 7
C. BAUD RATE ............................................................................................................................................................................... 7
D. PARITY AND STOP BITS .......................................................................................................................................................... 8
PART 4
– COMMUNICATION CONFIGURATION (APPLIANCES WITH AN LCD TEXT DISPLAY) ......................................... 8
A. MODBUS ENABLE ..................................................................................................................................................................... 8
B. MODBUS ADDRESS .................................................................................................................................................................. 8
