1st level 2nd level 3rd level 4th level
Data length 7 bits
8 bits
Stop bits 1
2
Parity none
uneven
even
Termination disabled
enabled
ignored
Modbus timeout 0 ... 10,000 ms
Priming time ...
...
Timer
Fieldbus Inactive
Active
Passive
...
2.5 “Modbus RTU” implementation
This chapter contains general information for implementing the
metering pump DULCO flex Control DFXa, DFXa into the serial
communication protocol of the Modbus RTU.
The metering pump DULCO flex Control DFXa, DFXa acts as a
slave (device 1).
Communication is possible between the metering pump DULCO
flex Control DFXa, DFXa (device 1) and external masters (device
0), such as a PLC.
The Modbus protocol is a communication protocol that enables
devices to use data via a joint connection if the devices communi‐
cate with each other via the “Modbus RTU” Modbus Application
Protocol Specification V1.1b3.
The “Modbus RTU” specification describes the “data link layer” and
the physical layer.
The notification structure of the function codes uses “Modbus RTU”
standards.
IEEE 32-bit floating point numbers and integers are used.
Supplementary operating instructions for Modbus RTU
31
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