how to read/write to usb serial port

[udi741]

Hello,

I got an rs-485 cable that goes into usb converter. (a usb cable is in use)

I followed an NI guide about how to install the usb driver so that MAX will be able to recognize it. (http://www.ni.com/tutorial/4478/en/)

finally i got the usb port appearing on MAX, but i cant communicate with that port.

is there any vi to test the connection?

MAX photo and windows drivers manager attached.

[GerdW]

Hi udi,

is there any vi to test the connection?

Do you see the "Open VISA Test Panel" button in your MAX screenshots? Why not use it?

For serial communication you can use any tool similar to "HyperTerm" for testing purposes…

[udi741]

i tried to use this option, but i cant read anything, and when im writing the simple commands (like *CLS\n) it just saying that the msg sent.

screenshots attached.

[GerdW]

Hi udi,

do other tools (like HyperTerm) work for you?

Does your device understand those "simple commands" like "*CLS\n"?

Do you use the termchar ("\n") as is expected by your device?

Which device are you using at all? What is connected to the other end of your USB-RS485 converter?

[udi741]

the device is a radiation meter, it has it own set of commands, but when i try to send them i got errors.

those commands look something like this:

1 48 48 48 49 49 52 99 116  114 48 65 29 4

[GerdW]

Hi udi,

the device is a radiation meter

Which type? Which manufacturer? Can you provide a link to a manual for this device?

Without any hard specs we cannot offer substantial help!

those commands look something like this:

I doubt those commands look like your example!

I guess they rather look like "\01000114ctr0A\1D\04" when using a string in \-code display mode! (Or "0130 3030 3131 3463 7472 3041 1D04" in hex display mode…)

Your device will only answer when it receives a correct request - so you need to send correct requests/commands…

[udi741]

thanks for the reply.

i am able to send now the data to the device through the MAX .

now, where i can find a vi that do the same? (i tried the examples of USB - Bulk and all the others, and none of them sees the usb port at all.)

Thanks!

[GerdW]

Hi udi,

for serial ports (aka COM ports) you use the "Basic/Advanced Serial Read and Write" examples.

(Or any other similar VI found here in the forum as your questions comes up very often…)

You still don't name the device type/manufacturer. Did you try the IDNet?