
Bronkhorst High-Tech B.V.
IQ+FLOW 17
9.17.045
3.5
Basic RS485 operation
This section is limited to the description of the interface between the IQ
+
FLOW® instrument with a master device. IQ
+
FLOW®
instruments always serve as slaves in a Modbus system. There is no mutual communication between Modbus slaves; only between
master and slave. The master device is for example a pc.
More detailed information about Modbus can be found at http://www.modbus.org or any website of the (local)
Modbus organisation of your country (when available).
3.5.1 Hook-up
The illustrations below show examples of a number of IQ
+
FLOW® instruments in an RS485 bus-system. When the power
consumption is more than 15W, two seperated power networks are required due to the maximum power supply of
15 W for one PiPS.
FLOW-BUS setup
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Y-Adapter cable
RJ-45
|
7.03.241
Male
End
Termin.
Female
9pin SubD
Male
Begin
Termin.
Male
RS -485
Multiport connector
RJ-45
|
7.03.299
0.5m patch cable
RJ-45
|
7.03.236
RS232 - USB2.0 adapter
RS232/USB
|
9.09.122
RS232 cable
RS232 | 7.03.234
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Female
RJ-45
Female
RJ-45
Male
RS-485
Male
RJ-45
Female
RJ-45
Female
RJ-45
9pin SubD
Female
FLOW-BUS interface
RS232
|
7.09.128
Y-Adapter cable
RJ-45
|
7.03.241
E-7000-05 PS
7.09.108 | 7.09.164
RS-485 kabel
RJ-45
|
7.03.467
End Terminator
RJ45
|
7.03.298
Begin Terminator
RJ45
|
7.03.298
Modbus setup
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Y-Adapter cable
RJ-45
|
7.03.241
End Terminator
RJ45
|
Male
End
Termin.
Male
Begin
Termin.
Male
RS -485
Multiport connector
RJ-45
|
7
RS-485 kabel
RJ-45
|
7.03.467
.03.299
RS485 - USB2.0 adapter
RJ-45/USB
|
7.03.470
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Male
RJ-45
Female
RJ-45
Female
RJ-45
Male
RJ-45
Female
RJ-45
Female
RJ-45
Y-Adapter cable
RJ-45
|
7.03.241
E-7000-05 PS
7.09.108 | 7.09.164
Begin Terminator
RJ45
|
7.03.297
7.03.298
RS232 stand alone setup
Male
RJ-45
Male
R S- 4 85
Male
RJ-45
F emale
RJ-45
F emale
RJ-45
Y-Adapter cable
RJ-45
|
7.03.241
Power Supply
PiPS-MV | 7.03.424
Adapter cable
RS232 - RJ45 | 7.03.426
9pin SubD
F emale
RS232 - USB2.0 adapter
RS232 - USB
|
9.09.122
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