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Posts: 40
Accepted Solution


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.

Accepted by topic author wantacobra
‎08-27-2015 06:09 PM
Posts: 131

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.




Jeff L.

Posts: 40

Re: pxi-8431



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