serial port data reciever abnormal.

[Nekomajin]

Hi,everyone I am using NI PXI 8431/8 serial card.

I got some problems.

there are 8 ports on this card.

I use this card to recieve datas on RS485 bus in 4-wire 422 mode with pin 4&5.

When I use the ports to recieve a 3-Bytes Frame as Hex 33 07 19.

Port 1~5 can get the right data.While port 6-8 get Hex 33 00 19.

But it seems that all the port can work correctly when I got the ports sending and recieving datas themselves.

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Can someone explain this,

or tell me how to analyse the problem?

Baud rate 38400.

Thanks.

Neko

[lin_wang]

as your tested, don't think there is any problem with the hardware,maybe u can try other orders or data to see if all the data with the same problem.