Communication
24 Sensyflow
FMT700-P
42/14-42-EN
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Kommunikation
6 Communication
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6.1 Digital
interfaces
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The digital interfaces provide the same mass flowrate value as the analog output. They enable
you to connect the device directly to digital systems without suffering any loss of accuracy as a
result of an additional conversion process. All the signal lines of the digital interface are
electrically isolated.
Electrical isolation:
Electrical isolation is achieved by means of an optocoupler consisting of an LED and a
phototransistor.
G00941
Fig. 19: Optocoupler
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6.1.1 Serial
interface
The serial interface (V24 / RS 232 C) supports the digital transmission of measured values and
can also be used to control all the possible operating functions of the supply /°evaluation unit
(bidirectional communication).
For the purpose of serial data transmission, only three lines are required for the systems
involved to exchange all the necessary communication signals. Addresses, data and control
information are transferred bit by bit. A distinction is made between synchronous and
asynchronous serial interfaces.
Synchronous serial data transmission
The transmitter inserts an additional synchronization character into the data stream at defined
intervals. At the receiver end, this character is detected using special logic. Any shifts are
corrected to ensure that the transmitter and receiver are synchronized.
