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Basic operation, 1 general, 2 analog operation – Bronkhorst IQ+FLOW (till 01-07-2013) User Manual

Page 11: General, Analog operation

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9.17.045

page 11

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, 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 paragraph 2.14.

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.