B&R X20BM15 Power module

DBC is the data byte count being returned. It must be two times the DAT number from the poll request. DATA is the data returned and is always a series of 2 byte integers. If 4 words were requested then DBC would be 8 and there would be 8 data bytes or 4 data words containing the requested data. The format of the data is N,8,1 meaning no parity, and 1 stop bit. Baud rate is selectable through the keypad / display. As shipped the baud rate is 9600. Communication to the BurnerLogix control is made through either of the RJ-12 jacks located on the underside of the control (note figure on right).

The jacks are internally 

wired in parallel to ease multi-dropping of BurnerLogix controls. The physical method for communications is RS485, half duplex. For each of the RJ-12 connections, the outside contacts are connected together and are designated as “A” or “+” while the inside contacts are connected together and are designated as “B” or “-”. Fireye supplies the ED512 cables in various lengths with RJ-12 plugs on each end. Refer to bulletin E-8002 for additional information. See page 49 for a table of currently available messages provided by the BurnerLogix programmers, followed by a description where necessary

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