ROD-4 MFC Controller

class pymeasure.instruments.proterial.ROD4(adapter, name='ROD-4 MFC Controller', **kwargs)

Bases: Instrument

Represents the Proterial ROD-4(A) operator for mass flow controllers and provides a high-level interface for interacting with the instrument. User must specify which channel to control (1-4).

rod4 = ROD4("ASRL1::INSTR")

print(rod4.version)             # Print version and series number
rod4.ch_1.mfc_range = 500       # Sets Channel 1 MFC range to 500 sccm
rod4.ch_2.valve_mode = 'flow'   # Sets Channel 2 MFC to flow control
rod4.ch_3.setpoint = 50         # Sets Channel 3 MFC to flow at 50% of full range
print(rod4.ch_4.actual_flow)    # Prints Channel 4 actual MFC flow in %

ch_1

Channel: ROD4Channel

ch_2

Channel: ROD4Channel

ch_3

Channel: ROD4Channel

ch_4

Channel: ROD4Channel

check_errors()

Read all errors from the instrument and log them.

Returns: List of error entries.

check_get_errors()

Check for errors after having gotten a property and log them.

Called if check_get_errors=True is set for that property.

If you override this method, you may choose to raise an Exception for certain errors.

Returns: List of error entries.

check_set_errors(): Read ‘OK’ from ROD-4 after setting.

clear(): Clears the instrument status byte

property complete

Get the synchronization bit.

This property allows synchronization between a controller and a device. The Operation Complete query places an ASCII character 1 into the device’s Output Queue when all pending selected device operations have been finished.

property id: Get the identification of the instrument.

property keyboard_locked: Set the front keyboard lock status.

property next_error: Get the next error of the instrument (tuple of code and message).

property options: Get the device options installed.

read(**kwargs): Read up to (excluding) read_termination or the whole read buffer.

read_binary_values(**kwargs): Read binary values from the device.

read_bytes(count, **kwargs)

Read a certain number of bytes from the instrument.

Parameters

count (int) – Number of bytes to read. A value of -1 indicates to read the whole read buffer.
kwargs – Keyword arguments for the adapter.

Returns bytes

Bytes response of the instrument (including termination).

reset(): Resets the instrument.

shutdown(): Brings the instrument to a safe and stable state

property status: Get the status byte and Master Summary Status bit.

property version: Get the version and series number. Returns x.xx<TAB>S/N

wait_for(query_delay=0)

Wait for some time. Used by ‘ask’ to wait before reading.

Parameters: query_delay – Delay between writing and reading in seconds.

write(command, **kwargs)

Write a string command to the instrument appending write_termination.

Parameters

command – command string to be sent to the instrument
kwargs – Keyword arguments for the adapter.

write_binary_values(command, values, *args, **kwargs)

Write binary values to the device.

Parameters

command – Command to send.
values – The values to transmit.
**kwargs (*args,) – Further arguments to hand to the Adapter.

write_bytes(content, **kwargs): Write the bytes content to the instrument.

class pymeasure.instruments.proterial.rod4.ROD4Channel(parent, id)

Bases: Channel

Implementation of a ROD-4 MFC channel.

property actual_flow: Measure the actual flow in %.

property flow_unit_display: Set the flow units on the front display. Valid options are %, sccm, or slm. Display in absolute units is in sccm for control range < 10 slm.

property mfc_range: Control the MFC range in sccm. Upper limit is 200 slm.

property ramp_time: Control the MFC setpoint ramping time in seconds.

property setpoint: Control the setpoint in % of MFC range.

property valve_mode: Control the MFC valve mode. Valid options are flow, close, and open.