can i connect serial cables to a Rt card without the interface (connect the serial cables to digital I/O)

[Anthares]

hello

I have a signal on RS232 but i have to take it on a RT card (7030/6040) because i don't want to pass through operative system and pc...i can't use an analog signal instead rs232 because i have noise problem on a slip-ring carrying the signal.

So i figured to attach cables of RS232 on the DAQ board, but some people said to me that is not possible to syncronize and buffer digitals I/O to recreate the serial protocol/transmission.
I 'd like to execute all my algorithm on the RT card, but if i can't reach to connect this serial signal on it i will be forced to use the pc for part of the algorithm, could u help me?

Has anyone of you ever co
nnected the cables of a serial interface on a DAQ board?

Thank you.

Anthares

[Chad_H]

RS-232 and National Instruments digital I/O are not meant to be compatible. One problem is the voltage level, although this can be resolved. The RS-232 bus uses approximately -12 volts for High Logic, and +10 volts for Low Logic, not 5 to 0 volts. Another problem is mimicking the RS-232 protocol with hardware and software. I don't know how you would do it, if you could do it.

If you want to access serial a serial port directly from a Real-Time program, you can run it on an RT Series PXI Controller, which has serial ports. Remember that serial communication is not deterministic.


When using the PCI-7030, you will need to access the serial ports on your PC with a VI running targeted to the host, and transfer that data to the RT Engine VI on the 7030 using shared mem
ory or TCP/IP.

Chad Humberstone
Application Engineering
National Instruments