Specifications

MODBUS COMMUNICATION MANUAL
5-5
5.4 BMS SETUP AS MASTER TO C-MORE BOILER CONTROLLERS
To set up the BMS as a Master to Control C-More Boiler Slaves, 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 HDR TEMP key until RS485 BAUDRATE is shown on the top line of the display.
Press the ▲ and ▼ arrow keys if necessary to set the baud rate to 9600.
3. Press the HDR TEMP key again until MIN SLAVE ADDR is shown in the display. Use the
▲ and ▼ arrow keys to set the address to zero.
4. Press the HDR TEMP key again until MAX SLAVE ADDR is shown in the display. Use the
▲ and ▼ arrow keys to set the address to zero.
5. Press the HDR TEMP key until NUMBER NETW BLRS is shown on the top line of the
display. Using the ▲ and ▼ arrow keys, set the number to the maximum number of C-More
Boilers that will be controlled on this Modbus Network.
NOTE
DO NOT count the C-More Boilers or Water Heaters that will only
be monitored on the Modbus Network. Only count the Boilers that
will be controlled by the BMS using the Modbus connection.
6. Press the HDR TEMP key until MODBUS CNTL TYPE is shown on the top line of the
display. Using the ▲ or ▼ arrow key, if necessary, set it to ROUND ROBIN.
7. Press the HDR TEMP key until NETW BOILER 1 is shown on the top line of the display.
Use the ▲ and ▼ arrow keys to set the address of the first Boiler being controlled on the
BMS RS485 loop. (This address must
be the same as the Comm Address setting in the C-
More Boiler Controller).
8. Press the HDR TEMP key again until NETW BOILER 2 is shown on the top line of the
display. Use the ▲ and ▼ arrow keys to set the address of the second Boiler being
controlled on the BMS RS485 loop. (This address must be the same as the Comm Address
setting in the C-More Boiler Controller).
9. Repeat step 8 for each additional C-More Boiler being controlled on the BMS RS485 loop.
10. This completes programming for the BMS RS485 Network. Press the FIELD ADJ key to
exit the Field Adjust Mode. The yellow LED on the key should go off.
IMPORTANT
Boilers #1 thru #8 are reserved for the Legacy Boilers connected
to the Pulse Width Modulation (PWM) connections on the BMS.
Therefore, NETW BOILER 1 is the same as Boiler #9. NETW
BOILER 2 is the same as Boiler #10 and so on.