PXI

[wantacobra]

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.

[JL@NI · Accepted solution]

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.

[wantacobra]

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