Is there a default value for NC_ATTRIB_BKD_PERIOD

I got a project and the value of NC_ATTRIB_BKD_PERIOD has been set to 10. I changed this value to 1 (I guess that's milliseconds) and the software runs much faster save about 20 seconds on a second test period formerly 60. I have used NEITHER CAN before and have never encountered this before setting and I was wondering if there is a default setting for this and if yes, what is it?

Hi John,.

If you look at the nican.h, you can see that the NC_ATTRIB_BKD_PERIOD is the legacy version of the NC_ATTR_PERIOD attribute.  (I say "If you look", but it is not really clear just looking at...) The NC_ATTR_PERIOD is documented as follows in the manual NI-CAN

NC_ATTR_PERIOD (period)
Duration specifies the rate of periodic behavior in milliseconds.
The behavior depends on the Type of Communication as follows:
NC_CAN_COMM_RX_BY_CALL
Duration specifies a minimum interval between the
transmissions. Even if ncWrite is called very often, executives
are transmitted over the network at a rate no more period.
Definition of period to zero disables the minimum interval timer.
NC_CAN_COMM_RX_PERIODIC
NC_CAN_COMM_RX_UNSOL
Time specifies the time between subsequent transmissions.
and must have the value greater than zero.
NC_CAN_COMM_TX_BY_CALL
NC_CAN_COMM_TX_PERIODIC
NC_CAN_COMM_TX_RESP_ONLY
Period specifies a timeout of watchdog. If an image is not received
at least once each period, a time-out error is returned. Setting
Period to zero disables the timer.
NC_CAN_COMM_TX_WAVEFORM

If the change you made will have different effects depending on your mode of transmission.  In my view, the default value is 0, but maybe it's not valid if you change the mode of transmission.

Let me know if you need more information.  Have a great day.

Tags: NI Products

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