Bronkhorst FlowDDE - Manual (Page 7)

BRONKHORST ®
2.2 RS232
ON MULTIBUS INSTRUMENT
The RS232 interface on a multibus instrument can be connected to any RS232 V24 serial (computer) port. Make sure
to respect the hook-up diagram. Bronkhorst offers special cables for communication, separating the RS232 lines from
the power and analog in- and output. On the 9-pin male D-sub connector of the instrument RX and TX are available on
pin 6 and pin 1.
Serial RS232 communication on a multibus instrument with RS232 can be treated as a FLOW-BUS system with one
instrument and a FLOW-BUS/RS232 interface. In case a FLOW-BUS fieldbus connection is present, other instruments
connected to the FLOW-BUS can be communicated with as well.
RS232 communication is possible by:
• 9-pin Sub D-connector (non-IP65 instruments, e.g. EL-FLOW)
• 8-pin DIN connector (IP65 instruments, e.g. CORI-FLOW)
For the exact connections please advise your hook-up diagram.
2.2.1 Applications, e.g. EL-FLOW
FLOW
EL-FLOW ® Select
mass flow meter/controller
Power
Supply
Instrument supplied through the D-sub DB-9 connector
FLOW
EL-FLOW ® Select mass flow meter/controller
DeviceNet / FLOW-BUS instrument supplied through the bus connector
FLOW
EL-FLOW ® Select mass flow meter/controller
Power
Supply
Profibus instrument supplied through the D-sub DB-9 connector
For proper cable installation please consult the applicable hook-up diagram mentioned in paragraph
1.2.2
By default, the interface offers communication at a baud rate of 38400 baud. On instruments that offer
the possibility to change the RS232 baud rate, the baud rate may be configured differently. See the
technical documentation of your instrument which baud rates are supported.
Page 7 FlowDDE 9.17.067