Programming the NI (PCI-8433/4) RS 422 in Labwindows CVI

[IVI]

Hi,

Am trying to receive RS422 serial data from my UUT in all 4 ports.

i downloaded and installed NI-Serial 3.90,but i couldnt locate any RS422 header file or the library.

can please some one help me to locate the Header and Library file.

Thanks in Advance!!!!

[Dennis_Knutson]

I used VISA and its properties for configuring.

[IVI]

 Thanks for the reply,

 so the NI-Serial is not required at all , i can control using the VISA directly?

 i found a header named rs232.h , i wonder if there is a similar header for RS422 as well

Thanks in advance!!

[Dennis_Knutson]

No, you still need NI-Serial but you can configure basis rate, etc. with VISA and use VISA for reads and writes.

[IVI]

Thanks

but VISA library functions seems to be generic functions.

i dint find any fucntion to control the input and output buffers properties.

using VISA is the only way to communicate with the RS422 card?

Thanks

[Dennis_Knutson]

What input and output properties are you talking about?

No, CVI has a separate serial library. I've always used VISA as it is the standard for instrument drivers and is portable - no code changes If the interface ever changes to something else such as Ethernet, USB, GPIB.

[IVI]

setting up the queue size and flushing the queue on conditions like that...

if so can you please  point me the CVI library for RS422 , where it will be available

however i installed NI-serial 3.9 package but i coudnt locate the Library in that.

Thanks in advance

[Dennis_Knutson]

VISA certainly has functions for setting and clearing the queue.

If I recall, it's called the Com library. This is for all serial port communication. There are not dedicated libraries for RS-232, RS-422, etc.

[IVI]

Thanks a lot.

can you help me with a sample VISA code if you have any.

Thanks

[Dennis_Knutson]

Have you looked at the examples that come with CVI? I don't have it installed right now so I can't pony to anything specific. There are also numerous CVI instrument drivers you can look at.