Hello,
i have a hardware configuration, where several power supplies and a multimeter are connect on one GPIB bus to a USB2GPIB device(Agilent 82357). On the PC I want to control the power supplies and the multimeter from different programs. Both programs open a session with viOpen(.., VI_EXCLUSIVE_LOCK,...), both programs set the timeout value to 50s with viSetAttribute(..., VI_ATTR_TMO_VALUE, 50000).
Any program works as long as the other is not started.
But if, e.g. the power control program is running (showing the actual currents) and I start the multimeter, some power readings failed with:
Error to get current: -1073807345 VI_ERROR_RSRC_LOCKED: Operation failed due to
locked resource
This is the error returned from
ErrorStatus=viPrintf(g_ps[psm_id-1].ps_sesn,"MEASure:VOLTage? (@%d)\n",output_id)
or
ErrorStatus=viScanf(g_ps[psm_id-1].ps_sesn,"%f",&value)
. After some seconds, both programs continue without any error anymore.
Does anybody has an idea, how I can avoid the collision of both programs. For my understanding these shall be happend by the locking of the resources. But it seems not to work. Any ideas?
Thanks,
David
