Device communication
CAUTION
When interface converters are used, galvanic separation must be ensured.
The BS bus and the BMS bus are only partially compatible.
Master slave principle
The BS bus works according to the master-slave principle. This means that the measuring device operates
as the master, while all sensor devices operate as slaves. The master is responsible for the communication
necessary for the measuring function. It also provides the required bus bias voltage for the operation of the BS
bus.
Adresses and address ranges on the BS bus
Address 1 is assigned to the master. All sensor devices receive unique addresses starting with address 2,
assigned in consecutive order without gaps. In the event of a device failure, a maximum gap of 5 addresses is
permissible.
7.3 Modbus RTU
Modbus RTU is implemented on the RS-485 interface. The data transmission is binary/serial. Error-free and
continuous data transmission must be guaranteed.
Measured values, messages and parameters are stored in virtual register addresses. Data can be read out with
a read command on the register address. With a write command, data can be written into a register address.
The register addresses of the individual measured values and parameters can be found in the manual EDS440/
EDS441 - Modbus settings at www.bender-uk.com/service-support/downloads/.
42 EDS44x_D00201_10_M_XXEN/11.2023
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