Bronkhorst®
Instruction Manual IQ+FLOW® Series Digital Mass Flow / Pressure Controllers for Gases
9.17.045V
13
3
Basic operation
3.1
General
An IQ
+
FLOW® instrument must be powered with +15…+24 Vdc according to the applicable hook-up diagram, supplied with
the instrument. The instrument can be operated by means of:
·
Analog interface: 0…5 Vdc; 0…10 Vdc; 0…20 mA or 4…20 mA (single-channel versions only)
·
Digital RS232 interface (FLOW-BUS (Propar) protocol)
·
Digital RS485 interface (Modbus RTU, Modbus ASCII or FLOW-BUS protocols)
By default the instrument is set as specified. The table below lists the supported interfaces for single-channel and multi-
channel versions.
Analog interface
(section 3.2)
Digital RS232 interface
(section 3.4)
Digital RS485 interface
(section 3.5)
IQF/IQP
(single-
channel)
0…5 Vdc; 0…10
Vdc;
0…20 mA; 4…20
mA
(software selectable)
FLOW-BUS (Propar) protocol on 9600,
19200, 38400, 57600 or 115200 Baud
(software selectable)
Modbus RTU and Modbus ASCII
protocols on 9600, 19200, 38400, 56000,
57600 or 115200 Baud; FLOW-BUS
protocol on 187500 or 400000 Baud
(software selectable)
IQM
(multi-
channel)
Not supported
FLOW-BUS (Propar) protocol on 38400
or 115200 Baud (select with rotary
switch)
Modbus RTU protocol on 9600, 19200 or
38400 Baud (select with rotary switch)
3.2
Analog operation
Analog operation is only possible with single-channel IQ
+
FLOW® instruments. Multi-channel instruments can only be
operated digitally. At analog operation the following signals are available:
·
Measured value (analog output) at pin 2
·
Setpoint (analog input/setpoint) at pin 3
The valve output is no longer available as analog signal with IQ
+
FLOW®. The selected analog interface (0…5 Vdc; 0…10 Vdc;
0…20 mA or 4…20 mA) can be found in the model key of the instrument. Refer to
Section 2.13
.
When operating the instrument through the analog interface it is possible to connect the instrument simultaneously to
RS232 for reading/changing parameters (e.g. settings or fluid selection).
Hook-up
For analog operation either an RJ-45 loose-end cable or an RJ-45 to 9-pin sub-D converter may be used to connect the
required signals.
Refer to the “Hook-up diagram IQ
+
FLOW®” or use an
RJ-45 loose-end cable (7.03.419) to connect the required
signals.
When using a Bronkhorst® readout unit use only an RJ-
45 cable (7.03.236) in combination with the RJ-45 to 9-
pin sub-D converter (7.03.376). With these items the pin
configuration is unchanged.
