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Interface
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Bender measuring device interface (BMS)
BMS protocol
The protocol for data transmission corresponds to the format for BENDER
measuring device interfaces (BMS protocol). Data transmission generally makes
use of ASCII characters.
Interface data are:
Baud rate: 9600 bauds
Transmission: 1 start bit, 7 data bits, 1 parity bit, 1 stopbit (1, 7, E, 1)
Parity: even
Checksum: sum of all the transmitted bytes = 0 (without CR and LF)
The BMS protocol works according to the Master-Slave principle. This means
that one device acts as Master while all other bus nodes are Slaves. It is
important that only one Master may be present in a network. All bus nodes are
identifi ed by a specifi c address. The Master scans all other devices of the bus
cyclically, listens to their signals and then carries out specifi c commands. The
Master function results from assigning address 1 to one IRDH375.
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