Contents
1. INTRODUCTION
De
fi
nitions .................................................................... 2
Minimum System Requirements .................................. 2
2. INSTALLATION
Wall Mount, Armor, Knight and Knight XL, Outdoor
Armor, Outdoor Knight, and Outdoor Knight XL........ 3-4
FTXL ............................................................................ 5
Wall Hung .................................................................... 6
3. MODBUS CONFIGURATION
Addressing
...................................................................
7
Timing
Speci
fi
cations ................................................... 8
Parity
............................................................................ 8
Data Transmission Mode ............................................. 8
ModBus Board Diagnostics ......................................... 8
Internal Faults ......................................................... 8
ModBus Function Set .................................................. 9
ModBus Exception Codes ........................................... 10
4. MODBUS MEMORY MAP
Primary Data Tables .................................................... 11
Memory Map............................................................11-12
Input Registers ....................................................... 12
Holding Registers ................................................... 12
Con
fi
guration Bits......................................................... 12
5. BACNET CONFIGURATION
....................................... 13
Addressing
................................................................... 13
Timing
Speci
fi
cations ................................................... 14
Communication Board Diagnostics ............................. 14
Internal Faults ......................................................... 14
6. BACNET MEMORY MAP
Primary Data Tables .................................................... 15
Crest Boiler Memory Map........................................15-16
Input Registers ............................................................ 15
Holding Registers ................................................... 16
7. WIRING REQUIREMENTS
Physical
Wiring
............................................................ 17
Control Inputs/Outputs............................................ 18-19
Control
Location.......................................................20-21
Typical Boiler/Water Heater System Wiring................ 22
8. UNIT OPERATION
Unit Operation with ModBus
Communications ..................................................... 23-27
9. TROUBLESHOOTING
........................................... 28-29
10. DIAGRAMS
Ladder & Wiring Diagrams ..................................... 30-39
Revision Notes ................................................... Back Cover
Abbreviation or Acronym
Meaning
ASCII
American Standard Code for Information Interchange
BACnet
A data communication protocol for Building Automation and Control Networks
BAS
Building Automation System
Baud (Baud Rate)
Number of data bits transmitted per second (bps)
EMS
Energy Management System
FDX
Full-Duplex
HDX
Half-Duplex
Hex
Hexadecimal Number (0 - 9, A - F)
I/O Box
Input/Output (I/O)
LSB
Least Signi
fi
cant Byte
ModBus
A serial, half-duplex data transmission protocol developed by AEG Modicon
MSB
Most Signi
fi
cant Byte
RS232
A standard for serial, full-duplex (FDX) transmission of data based on the RS232
Standard
RS485
A standard for serial transmission of data based on the RS-485 Standard
RTU
Remote Terminal Unit
1
Introduction
Th
e information contained in this manual provides general guidelines for the implementation of ModBus and BACnet
communication with the Lochinvar Armor water heaters (151 - 801), Wall Mount Armor (125-200), Knight (81-286), Knight
XL (400 - 801), Outdoor Knight (151-286), Outdoor KnightXL (400-801), Outdoor Armor (151-801), Wall Mount (51 - 211),
and Wall Hung (55 - 399) boilers.
All ModBus networks are implemented utilizing a master-slave arrangement where all boilers/water heaters are slaves and
the master is a building automation system capable of communicating over a RS-485 half duplex serial connection. BACnet
networks are implemented using a token passing process where multiple masters and slaves share a common RS-485 bus. Th
e
Lochinvar BACnet interface is a master only.
De
fi
nitions
Minimum System Requirements
•
BAS system or computer with a serial or USB port
with a converter to RS-485 half duplex.
•
Unit equipped with communication board.
•
Shielded twisted pair communication cable.