AERCO Modbus Communications Manual - Manual (Page 77)

Chapter 5
MODBUS
Communication GF-114
C-More/BMS Software Setup USER MANUAL OMM-0035_0C
05/18/12 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 Page 77 of 200
NOTE
The AERCO BMS can function as either a Slave or a Master on a
Modbus Network. Paragraph 5.3 provides the programming setup
procedures when the BMS is a Slave to an EMS (or BAS).
Paragraph 5.4 provides the programming setup procedures when
the BMS is the controlling Master for C-More Boiler Controllers.
5.3 BMS SETUP FOR OPERATION AS A SLAVE TO AN EMS MASTER
The BMS can be programmed as a Slave to an EMS Master on the Modbus Network in two
ways:
• Monitoring and Configuration Only
• Modbus Remote Setpoint Control and Monitoring
The setup procedures for the above operating configurations are provided in paragraphs 5.3.1
and 5.3.2 which follow.
5.3.1 BMS Monitoring and Configuration By An EMS Master
To set up the BMS to be monitored or configured on the Modbus Network, proceed as follows:
1. Press the FIELD ADJ key on the BMS front panel to enter the Field Adjust Mode. The
yellow LED on the key should be lit.
2. Press the AIR TEMP key until RS232 MODE is shown on the top line of the display. If
necessary, press the ▲ or ▼ arrow key until MODBUS SLAVE appears in the second
line of the display.
3. Press the AIR TEMP key again until RS232 BAUDRATE is shown on the top line of the
display. Press the ▲ or ▼ arrow key to select the appropriate baud rate.
4. Press the AIR TEMP key again until MODBUS ADDRESS is shown on the top line of the
display. Press the ▲ or ▼ arrow key to set the desired address for the BMS on the
Modbus Network.
5. Press the FIELD ADJ key to exit the Field Adjust Mode. The yellow LED on the key
should go off.
The BMS is now set up to be monitored or configured on the Modbus Network. Remember that
the configuration can only be changed on the Modbus Network by first entering a valid password
for PASSWORD LO and PASSWORD HI.
5.3.2 BMS Modbus Remote Setpoint Control By An EMS Master
To configure the BMS for Remote Setpoint Control from an EMS Master, proceed as follows:
1. Press the FIELD ADJ key on the BMS front panel to enter the Field Adjust Mode. The
yellow LED on the key should be lit.
2. Press the AIR TEMP key until RS232 MODE is shown on the top line of the display. If
necessary, press the ▲ or ▼ arrow key until MODBUS SLAVE appears in the second
line of the display.
3. Press the AIR TEMP key again until RS232 BAUDRATE is shown on the top line of the
display. Press the ▲ or ▼ arrow key to select the appropriate baud rate.
4. Press the AIR TEMP key again until MODBUS ADDRESS is shown on the top line of the