Hello,
I'm using NI VISA 2.6 controlled by a C++ATL component.
I'm trying to debug why command-response type communication
takes apparently so much longer under TCPIP than RS-232 using the NI VISA driver.
From my application program standpoint, there is no difference between
TCPIP and RS-232 once the port is opened. I put a timer around the communication calls and and it takes 60-70 system ticks to complete using RS-232 at 38.4 kbaud. Approx 148 characters are recieved.
NISpy reports the last line in the response comes back 70-80ms after the initiating command.
Using TCPIP, the same thing takes 360-400 ticks to complete.
But using the NI spy program, it generally reports that the response comes back
in about 10ms.
Anyone have any hints on this?
