6720892984 (2019/02) US SSB
6 | STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE
2 STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE
2.1 General
The 900 series burner controls are designed to function as a standalone control unit for intermittent operation on heating appliances with a premix
(modulating) burner and a pneumatic air-gas system.
This specication is suitable for the following version:
PN: 900MN 900MN type for Commercial units
2.2 905TS Control Systemn
The following scheme shows the communication protocols the 905 Modules use to communicate with each other:
AL-BUS MODBUS
905TS Touch Screen (COM2)
905PB Display (J25)
905MN control (J6)
2.2.1 Modbus connection 905PB and 905TS
The 905TS has a port on the backside called ‘COM’, which is used to communicate with the 905PB display by MODBUS. The following illustration shows
the location of the COM port (backside 905TS) and pin-numbering:
6 7 8 9
1 2 3 4 5
LANUSB1USB2
COM
24VDC
+ -
Primary connection to 905PB:
Communication Pin Function Connect to
6 7 8 9
1 2 3 4 5
COM2
(Master)
5 GND 905 PB (J25-1)
7 RS 485 + 905 PB (J25-3)
8 RS 485 - 905 PB (J25-2)
Optional secondary interface:
Communication Pin Function Connect to
6 7 8 9
1 2 3 4 5
COM1
(Slave)
2 RS 232 RXD External Adapter RS 485
3 RS 232 TXD External Adapter RS 485
5 GND
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