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wantacobra
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pxi-8431

A question regarding the PXI-8431/8 serial port card:  Is it possible to directly control the TX (transmit) & read the state of the RX (receive) lines?    I need to implement a serial communication scheme using separate data and clock similar to SPI using differential line drivers.

 

Looking at the RS-485 Transceiver Control.vi example, I see that it is possible to control the state of the serial port control signals, CTS, DCD, DSR, DTR, RI, and RTS.

Member
JL@NI
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Re: pxi-8431

Hello wantacobra,

 

You will not be able to directly control the TX & RX lines because the PXI-8431 is specifically designed for RS-485/422 protocol. The transmit and receive lines will always expect a serial packet. Yes, you can control the serial port control signals, but not the TX & RX lines directly. It would probably be better to get a chip specifically designed for the protocol you are trying to use.

 

Regards,

 

Jeff L.

Applications Engineer | National Instruments
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wantacobra
Posts: 40
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Re: pxi-8431

Jeff

 

Thanks for your prompt response to confirm my conclusions.  Our team is now working to change the interface to one compatible with the card.

 

Mike