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VISAdrv
ASYN driver for National Instruments VISA
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VISAdrv
ASYN driver for National Instruments VISA
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driver private data structure More...
Public Attributes | |
| asynUser * | pasynUser |
| char * | portName |
| asyn port name More... | |
| ViSession | defaultRM |
| ViSession | vi |
| VISA session handle. More... | |
| bool | connected |
| are we currently connected More... | |
| char * | resourceName |
| VISA resource name session connected to. More... | |
| unsigned long | nReadBytes |
| number of bytes read from this resource name More... | |
| unsigned long | nWriteBytes |
| number of bytes written to this resource More... | |
| unsigned long | nReadCalls |
| number of read calls from this resource name More... | |
| unsigned long | nWriteCalls |
| number of written calls to this resource More... | |
| double | timeout |
| requested timeout for current operation More... | |
| bool | isSerial |
| are we an RS232 style serial device? More... | |
| bool | isGPIB |
| are we a GPIB device? More... | |
| bool | deviceSendsEOM |
| Indicates that the device signals an "end of message". More... | |
| int | readIntTimeout |
| internal read timeout (ms) used instead of a zero timeout immediate read. More... | |
| ViUInt8 | termCharIn |
| read termination character, this is purely to improve read efficiency and is independent of any characters specified at the asyn or stream device later. More... | |
| bool | flush_on_write |
| use viFlush to flush output buffer every write More... | |
| asynInterface | common |
| asynInterface | option |
| asynInterface | octet |
driver private data structure
Definition at line 36 of file drvAsynVISAPort.cpp.
| asynInterface visaDriver_t::common |
Definition at line 54 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure().
| bool visaDriver_t::connected |
are we currently connected
Definition at line 41 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), closeConnection(), connectIt(), drvAsynVISAPortConfigure(), flushIt(), getOption(), readIt(), setOption(), and writeIt().
| ViSession visaDriver_t::defaultRM |
Definition at line 39 of file drvAsynVISAPort.cpp.
Referenced by connectIt(), drvAsynVISAPortConfigure(), and visaCleanup().
| bool visaDriver_t::deviceSendsEOM |
Indicates that the device signals an "end of message".
If this is true, then the driver can assume that a VI_SUCCESS call translate to ASYN_EOM_END and this will stop a further call from Stream device if there are no termination characters to otherwise know all output has been received. GPIB devices usually signal END, RS232 serial devices do not and you need to look for a termination character instead etc.
Definition at line 50 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), drvAsynVISAPortConfigure(), and readIt().
| bool visaDriver_t::flush_on_write |
use viFlush to flush output buffer every write
Definition at line 53 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure(), setOption(), and writeIt().
| bool visaDriver_t::isGPIB |
are we a GPIB device?
Definition at line 49 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), connectIt(), and drvAsynVISAPortConfigure().
| bool visaDriver_t::isSerial |
are we an RS232 style serial device?
Definition at line 48 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), connectIt(), drvAsynVISAPortConfigure(), getOption(), and setOption().
| unsigned long visaDriver_t::nReadBytes |
number of bytes read from this resource name
Definition at line 43 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), and readIt().
| unsigned long visaDriver_t::nReadCalls |
number of read calls from this resource name
Definition at line 45 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), and readIt().
| unsigned long visaDriver_t::nWriteBytes |
number of bytes written to this resource
Definition at line 44 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), and writeIt().
| unsigned long visaDriver_t::nWriteCalls |
number of written calls to this resource
Definition at line 46 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), and writeIt().
| asynInterface visaDriver_t::octet |
Definition at line 56 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure().
| asynInterface visaDriver_t::option |
Definition at line 55 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure().
| asynUser* visaDriver_t::pasynUser |
Definition at line 37 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure(), getOption(), setOption(), and visaCleanup().
| char* visaDriver_t::portName |
asyn port name
Definition at line 38 of file drvAsynVISAPort.cpp.
Referenced by driverCleanup(), drvAsynVISAPortConfigure(), getOption(), setOption(), and visaCleanup().
| int visaDriver_t::readIntTimeout |
internal read timeout (ms) used instead of a zero timeout immediate read.
Stream device will use such a timeout to flush the input buffer prior to a write, also the driver may use it internally to check for bytes. If you get problems with 0 as this value, try either a small positive number, or if you set it to a negative number then any read call with zero timeout will be replaced with a viFlush() call to clear the input buffer. Such an assumption is valid for stream device, not necessarily for other drivers. Note that for GPIB/ENET we found that such zero timeout reads of no data took much longer than normal reads, hence the option to skip them via a negative timeout.
Definition at line 51 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), drvAsynVISAPortConfigure(), and readIt().
| char* visaDriver_t::resourceName |
VISA resource name session connected to.
Definition at line 42 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), closeConnection(), connectIt(), driverCleanup(), drvAsynVISAPortConfigure(), flushIt(), getOption(), readIt(), setOption(), and writeIt().
| ViUInt8 visaDriver_t::termCharIn |
read termination character, this is purely to improve read efficiency and is independent of any characters specified at the asyn or stream device later.
It allows a read to terminate early without waiting for a timeout, if the calling layer is stream device then it will still decide whether it has all the correct characters or not.
Definition at line 52 of file drvAsynVISAPort.cpp.
Referenced by asynCommonReport(), connectIt(), and drvAsynVISAPortConfigure().
| double visaDriver_t::timeout |
requested timeout for current operation
Definition at line 47 of file drvAsynVISAPort.cpp.
Referenced by drvAsynVISAPortConfigure(), readIt(), and writeIt().
| ViSession visaDriver_t::vi |
VISA session handle.
Definition at line 40 of file drvAsynVISAPort.cpp.
Referenced by closeConnection(), connectIt(), getOption(), readIt(), setOption(), and writeIt().
1.8.5