Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
23
3.5
Basic RS485 operation (FLOW-BUS/Modbus)
This section is limited to RS485 FLOW-BUS or Modbus communication. See section
communication through other fieldbus interfaces.
FLOW-BUS or Modbus communication is available if either the FLOW-BUS or Modbus RJ-45 connector on top of the
instrument is present, or if the 9-pin D-sub side connector is set for FLOW-BUS or Modbus communication. The serial
number label indicates the factory settings of the connector pinning.
FLOW-BUS
FLOW-BUS is a Bronkhorst® designed fieldbus, based on RS-485 technology, for digital communication between devices,
offering the possibility of host-control by a Windows computer.
Characteristics:
·
Baud rate 187500 (default) or 400000 Baud
·
+15…24 Vdc supply voltage
·
Easy installation and communication with other Bronkhorst® devices
·
Automatic node search and bus optimization (gap fixing)
·
RS-232 communication (
ProPar
) with Windows computer (local host)
·
Connection of up to 120 instruments on a single bus
·
Maximum bus length: 600 m
Consult
Instruction manual FLOW-BUS interface
(document no. 9.17.024) for more information about setting up a
FLOW-BUS network.
Modbus
Modbus is a 3-wire, RS-485-based fieldbus communication system for parameter value exchange. In this system each
instrument/device is equipped with a micro-controller for its own dedicated task. The instrument behaves as a slave, which
means all communication (instructions and readout) is initiated by a master device on the Modbus system.
Characteristics:
·
Baud rate selectable between 9600 and 256000 Baud (default: 19200 Baud)
·
+15…24 Vdc supply voltage
·
Connection of up to 247 instruments on a single bus
·
Supports RTU and ASCII protocols
Consult
Instruction manual Modbus interface
(document no. 9.17.035) for more information about setting up a
Modbus network.
More detailed information about Modbus can be found at
or any website of the (local) Modbus
organization of your country (if available).
