SDK - function to check if device is still connected

[kojak]

Hello @attila,

I am writing application in Python and I do not find any function which tells me if already opened device (AD2) is still connected into the system. I need this function in order to inform user about disconnected device and to stop the measurement process and wait for device to be accessible.

Thank you

[attila]

Hi @kojak

You can use almost any function (*set, *configure, *status) to see if the device is connected since the function will fail if the device is not present. 
If you use the analog-io-status you can update some device information (supply and temperature), see AnalogIO_AnalogDiscovery2_SystemMonitor.py

if dwf.FDwfAnalogIOStatus(hdwf) == 0 :
  szerr = create_string_buffer(512)
  dwf.FDwfGetLastErrorMsg(szerr)
  print szerr.value
  break;
# get system monitor readings
dwf.FDwfAnalogIOChannelNodeStatus(hdwf, c_int(2), c_int(0), byref(usbVoltage))
dwf.FDwfAnalogIOChannelNodeStatus(hdwf, c_int(2), c_int(1), byref(usbCurrent))
dwf.FDwfAnalogIOChannelNodeStatus(hdwf, c_int(2), c_int(2), byref(deviceTemperature))
dwf.FDwfAnalogIOChannelNodeStatus(hdwf, c_int(3), c_int(0), byref(auxVoltage))
dwf.FDwfAnalogIOChannelNodeStatus(hdwf, c_int(3), c_int(1), byref(auxCurrent))

 

[kojak]

Hi @attila

Thank you, works like a charm. Do not know why I did not used return value form functions. Now I see on top of page 7 in SDK documentation return values description.