Page 15 Instruction manual Parker X-Flow FM-1407 Rev - 11/2021
3.3 Digital communication protocol detection
(Flow-BUS RS232 or MODBUS® RS485)
According to the pin-designation both RS232 and RS485 are assigned to the same pins.
At each power-on/off the X-Flow™ instrument the digital communication protocol from the master
(PLC/PC) must be detected by the X-Flow™ instrument. This auto detection cannot be switched off or
by-passed.
Description
At each power-on of the
X-Flow™ instrument a
protocol detection
routine is started and the
communication lines
switch each 110 mS
between:
RS232 FLOW-BUS,
RS485 Modbus®-RTU,
RS485 Modbus®-ASCII.
If received data is
recognized within the
particular time frame of a
protocol, then it will
immediately switch to
this protocol for 660 mS.
If a valid message is
received the instrument
will answer (reply) to this
message and stay in the
detected protocol.
The protocol is detected.
The instrument will
remember the detected
protocol while the
instrument is powered
on.
3.4 Basic RS232 Flowbus® operation
RS232 Flowbus® communication can be used for operating your instrument using the FlowDDE server
application. Dynamic Data Exchange (DDE) provides the user a basic level of inter-process
communication between Windows applications.
Physical layer and communication protocol are detected automatically upon reception of
messages. These messages must be sent using the correct combination of physical layer and
communication protocol. After every power-up the communication detection mode is active.
FlowDDE is a DDE server application. Together with a client-application, either self-made or with a
SCADA-program from 3rd-parties, it is possible to create an easy way of data exchange between the
flow controller and a Windows application.
For example, a cell in Microsoft® Excel® could be linked to the measured value of the flow controller
and when the measured value changes, it will be automatically updated in the Excel® spreadsheet.
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