Bjong – User Manual – V1.0 - pg.39
12
Configuration
12.1 Sensors connected to RS485 port
This button on the left is used to access the settings of the RS485 port of the Bjong.
There are two firmware versions of the instrument that allow different management of the
port: EasySetup, based on the instrument firmware, will show different configuration
screens.
A first version, called “Standard”, allows the reading in simplified form of variables from one or more
sensors simultaneously using the standard Modbus RTU protocol.
A second version, called “Flow”, allows the management of one of the sensors for measuring the flow rate
(and some additional parameters) supplied by B.M. Tecnologie Industriali: doppler sensors for measuring
the flow in open channels or pipes, and ultrasonic sensors for full pipes.
It is possible to install one of the two versions independently by performing the firmware
update.
A factory reset is mandatory when switching from one version to another it is necessary to
perform a factory reset. In this case the data stored on the Bjong will be lost.
12.1.1 RS485 standard
The firmware version called Standard, allows the reading of variables from sensors that use the standard
Modbus RTU protocol. The sensors, among other things, can use the power supply directly on the RS485
connector of the Bjong.
It is possible to read up to a maximum of 20 variables, even on different slaves. Each variable consists of
reading coils or discrete inputs (up to a maximum of 32) or registers (holding register or inputs register)
of integers (16 bits with or without sign), 32-bit long or float registers in different formats ABCD, BCAD,
BADC, DCBA.
For each variable, the label, the unit of measurement and any number of decimal places for rounding can
be defined.
A multi slave connection is possible on the RS485 port as long as all sensors use the same
serial communication configuration (speed, parity, data bits and stop bits).
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