Hi all, I have a NI DAQ usb 6009 device and hooked up a D-sub serial port (TxD line) in to one digital Input port. What I want to do here is to read TxD and reconstruct the digital signal. My problem is .. [dev / port0 ] 0 1 0 1 1 1 .... I am getting one line binary signal (of course) and looks like this data array is not complete. Meaning that if I change this signal to HEX, data doesn't have meaning at all. Baud rate for the serial port is 9600. I am not sure 1) if my sampling freq. isn't right.: it's like 10Hz fs. 2) is there anyway that I can receive data otherthan true, false but digital bit array? Can anybody help? Thanks in advance, -E

Serial communication also has other lines, see e.g. here for RS-232: http://en.wikipedia.org/wiki/Serial_port, in particular RTS and CTS lines to synchronize. If it's not RS-232 but other serial communication (SDI) there are other lines like CLK, LOAD (or CS) that the master sends and the slave uses to synchronize. If you can't read data at 9600 baud you'll have to find a way to lower the baud rate or use another device to receive it. But I would be surprised if the 6009 can't handle 9600 Samples/s. This might not work in single sample measurements like you've shown, you'll have to read multiple samples at a time.

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Thanks,

actually i am referring to your older replies.. That's helping me . 😃

-E

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Re: Boolean data