Specifications

MODBUS COMMUNICATION MANUAL
ii
TABLE OF CONTENTS - Continued
PARA.
PAGE
3.3 BMS STANDARD APPLICATION OPERATIONS 3-3
3.3.1 Password Protection For BMS Input and Holding Register Access 3-3
3.3.2 Remote Setpoint Control of BMS Slave By EMS Master 3-3
3.3.3 BMS Master Control of C-More Slaves Via Network 3-4
3.3.4 BMS Combination Mode Boiler Controller of C-More Slaves 3-4
SECTION 4 – MODBUS NETWORK SETUP & INSTALLATION 4-1
4.1 INTRODUCTION 4-1
4.2 PHYSICAL MODBUS NETWORK WIRING CONNECTIONS 4-1
4.2.1 BMS Slave To EMS Master Wiring Connections 4-1
4.2.2 BMS Master To C-More Boiler Controller Slaves 4-5
4.2.3 C-More Slaves To BMS or EMS Master 4-7
4.3 RS485 LOOP TERMINATING RESISTORS AND BIAS 4-7
4.3.1 BMS Terminating Resistor 4-7
4.3.2 C-More Boiler Controller Terminating Resistor and Bias 4-7
4.4 MODBUS NETWORK WIRING DIAGRAMS 4-11
4.4.1 Wiring Diagram for EMS Master Controlling BMS Slave With Legacy
(PWM) Boilers
4-11
4.4.2 Wiring Diagram for BMS Master Controlling C-More Controller Slaves 4-11
4.4.3 Wiring Diagram for EMS Master Controlling C-More Controller Slaves 4-11
SECTION 5 – MODBUS SOFTWARE SETUP 5-1
5.1 INTRODUCTION 5-1
5.2 C-MORE BOILER CONTROLLER SETUP FOR MODBUS
OPERATION
5-1
5.2.1 Modbus Monitoring and Configuration Control 5-1
5.2.2 Modbus Direct Drive Control and Monitoring 5-2
5.2.3 Modbus Remote Setpoint Control 5-2
5.3 BMS SETUP FOR MODBUS OPERATION AS A SLAVE TO AN EMS 5-3
5.3.1 BMS Monitoring and Configuration By An EMS Master 5-3
5.3.2 BMS Modbus Remote Setpoint Control By An EMS Master 5-4
5.4 BMS SETUP AS MASTER TO C-MORE BOILER CONTROLLERS 5-5
APPENDIX A - C-MORE BOILER CONTROLLER STATUS & FAULT
MESSAGES & CONVERSION EQUATIONS
A-1