Specifications

MODBUS COMMUNICATION MANUAL
4-5
Figure 4-4. BMS RS232 & RS485 Connectors
4.2.2 BMS Master To C-More Boiler Controller Slaves
Wiring connections for Modbus operation between a BMS Master and C-More Boiler Controller
Slaves are made between the BMS internal RS485 connector (Figure 4-1) and the I/O Box for
the associated C-More Boiler Controller. The BMS internal RS485 connector pinouts are shown
in Figure 4-4. The RS485 COMM connections at each Boiler’s I/O Box are shown in Figure 4-5.
Identical I/O Boxes are used for both Benchmark and KC1000 Boilers.