KROHNE Summit 8800 Vol 3 - Manual (Page 125)

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08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 COMMUNICATION 08
Master type Select the device connected to the port. As field devices are available: meters,
provers, redundant Summits or gas chromatographs.
Please note that the master types shown are dependent on the stream type selection.
8 .3 .3 Differential pressure meters
dP meters often use multi-variable transmitters. Most are Hart based, but some are modbus
based, such as the Emerson Bristol 308 is a multivariable transmitter with differential pressure,
pressure and temperature.
Figure 171 Modbus Bristol 3808 MVT
With as parameters:
Inter-packet
delay
In a noisy environment characters may be lost causing two packets frames to be mixed.
This is prevented by putting a delay at the end of each packet. Not needed for TCP/IP.
Timeout Time to stop connectivity attempts between the devices
Retries Number of attempts to establish communication before an alarm is given
Stream Select the stream where the transmitter is installed
Modbus ID Unique identifier for the Modbus device