Reading PCI-6023 counter by Delphi/NI-DAQ

[Rawi Eggert]

One current goal of mine is to read the counter of an NI I/O board PCI-6023E by Delphi using NI-DAQ driver commands. For Delphi/NI-DAQ *without ActiveX* don't exist any NI examples yet. In VB works the "same" prog fine.

http://www.home.fh-karlsruhe.de/~egra0011/Projects/SIM
What part is in my code "PCI6023E_Counter.pas" missing? Are the NI-DAQ commands/driver working with Delphi?
Thanks.

[Raecine Meza]

I am not familiar with Delphi syntax, but you are using the correct NI-DAQ functions and in the correct order. Make sure you are connecting your digital pulse to the correct pin. You should be connecting the signal to the Source of the specified counter. You are using Counter 1, so that should correspond to pin 37 of the PCI-6023E.

Also, the count value returned is not going to be meaningful until your signal has pulsed so that the count will increment. It would be more useful to call the GPCTR_Watch in a loop to see if the count is incrementing when it sees new pulses.

In general, if you are interested in making NI-DAQ function calls instead of using Active X in Delphi, run NI-DAQ Setup and install the Borland C examples. The syntax will be different, but t
he NI-DAQ function calls and programming structures will be the same for your own Delphi code.

Raecine Meza
National Instruments
http://www.ni.com/ask