usb

[ayman22]

i want to generate only (0 or1) signal  using usb
can ido it with vision builder or not &how
if not how can ido it with lab view ??

[Dennis_Knutson]

You can generate a 0 or 1 signal if the device you have connected to the USB port supports 0 and 1 signals. You have to specifiy the actual device you are planning on using if you want an answer.

[jack07]

you can generate if your usb does suport to 0 and 1 function

[ayman22]

i want to get a (0 or 1) signal from usb to the plc
i will use a"usb to serial converter " and take the status of one pin of the serial as an input "switch"to the plc

[Dennis_Knutson]

A USB-RS232 is going to give as much as +/- 15 volts. It is not a 0 to 5 volt TTL signal.

[ayman22]

no proplem ican deal with that 
but how can ido that by usb in vision builder

[[dk]]

Is there a particular reason you are wanting to use Vision Builder instead of LabVIEW? I am curious as to what your application is that would require Vision Builder.

[Buechsenschuetz]

The data lines/pins of a serial interface are rather dynamic, i.e. their state is changed when a data stream flows. Usually it is not possible to change their state in a static manner. The serial interface also has some control lines which are rather static. But you do not have direct access to these pins (or to their control registers) with a Windows operating system. Maybe there is some software which can control them directly.

In your case I would suggest to use a USB to digital input/output adapter, they are just as common as USB to serial adapters. With such a device, you can control the state of each output pin separately.