Port manager: Difference between revisions
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=== | === Communication === | ||
If the port manager is activated, the port is automatically available within all functions of the [[sequencer procedure]] as the variable | If the port manager is activated, the port is automatically available within all functions of the [[sequencer procedure]] as the variable: | ||
{{syntaxhighlight|lang=python|code= | {{syntaxhighlight|lang=python|code= | ||
self.port | self.port | ||
}} | }} | ||
A message can be sent using | A message can be sent using: | ||
{{syntaxhighlight|lang=python|code= | {{syntaxhighlight|lang=python|code= | ||
self.port.write("string of the message without end-of-line/terminator character") | self.port.write("string of the message without end-of-line/terminator character") | ||
}} | }} | ||
The answer of a device is acquired by | The answer of a device is acquired by: | ||
{{syntaxhighlight|lang=python|code= | {{syntaxhighlight|lang=python|code= | ||
var = self.port.read() | var = self.port.read() | ||
}} | }} | ||
Revision as of 12:18, 28 November 2017
SweepMe! supports and simplifies communication to devices via RS232 (COM port), GPIB, USB and TCPIP by using the SweepMe! Port manager.
Introduction
The communication with the hardware is usually done in each Device Class. In order to simplify the process of creating the communication channel, i.e. establish a connection, SweepMe! provides the port manager for easy handling.
Supported protocols
- COM: standard PC serial port using RS-232 protocol
- GPIB: an IEEE-488-Bus, a standard communication
- USB: plug and play USB test and measurement device as supported by pyvisa
- VB: a National Instrument VirtualBench device
Usage
Configuration
The following variables have to be set within the __init__ function of a Device Class:
In order to get the available ports listed in the GUI of the corresponding Measurement Class, choose desired port types by:
self.port_types = ["COM", "GPIB", "USB", "VB"]
A port object is automatically created by
self.port_manager = True
Further parameters can be changed through
self.port_properties = {
"baudrate" : 9600,
"EOL": "\n",
...
}
Get a list of all port_properties using
print self.port_properties
Communication
If the port manager is activated, the port is automatically available within all functions of the sequencer procedure as the variable:
self.port
A message can be sent using:
self.port.write("string of the message without end-of-line/terminator character")
The answer of a device is acquired by:
var = self.port.read()