Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
18
1.
2. Fieldbus (top connector) (example: none)
3.
Customized I/O setting (pin 5)
4. Analog interface (pin 2, 3) (example: inactive setpoint source, measure always
available)
5. Digital interface (pin 1, 6) (example: RS232, active setpoint source)
6. Side connector digital interface settings (protocol, medium, baud rate, parity)
(example: FLOW-BUS (ProPar) communication over RS232 interface with baud rate
115200 Baud and no parity)
3.3
Analog operation
The following analog signals are available for each instrument through the 9-pin D-sub side connector:
·
Measured value (analog output): pin 2
·
Setpoint (analog input/setpoint): pin 3
The factory selected analog interface (0…5 Vdc; 0…10 Vdc; 0…20 mA or 4…20 mA) can be found in the
instrument and in the pin description on the serial number label.
Pin 5 is used for customized I/O configurations. By default it is disabled and pulled down to 0 Vdc. The factory selected pin 5
configuration can be found in the
and the pin description on the serial number label. See also section
Customized I/O options (pin 5)
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).
3.3.1
Cabling
Use a loose-end cable with a 9-pin D-sub female connector on the
instrument side (art. no. 7.03.004, 7.03.536 or 7.03.537) and refer to the
hook-up diagram for analog operation to connect the required signals.
3.4
Basic RS232 operation
Digital RS232 (or bus) operation adds a lot of extra features to the instruments compared to analog operation, such as:
·
Multi gas / multi range functionality; up to eight selectable and customizable fluids (
·
Direct reading with a readout/control module or host computer
·
Device identification and diagnostics (
)
·
Adjustable minimum and maximum alarm limits (
)
·
(Batch) counter (
Each instrument process is controlled (internally) by specific parameters. The instrument parameter values are accessible
through the available digital interfaces to influence the instrument behavior. In this section it is explained how to operate
an instrument using RS232 communication.