Interface Extech IR Tester 380366 with LabVIEW 8.0

[Geoff1]

I have a project where I am trying to use labVIEW to control an insulation resistance tester made by extech model #380366. I am trying to control this device through the RS-232 Port. I actually found an example in the LabVIEW help files where I can input a hex code through RS-232 but I can not seem to get the instrument to respond correctly. In the data sheet it gives me a list of commands that control the function of the IR Tester and what the instruments response should be based on the command. I am just trying to start by doing something basic. You can turn a backlight on the meter by simply sending a command in Hex to the device so this is what I am starting with I just can not seem to get it right. The example I am using does seem to get a message back from the instrument but not what the command protocols says it should be. Does anyone have any experience with extech instruments. I have attached the command protocol I have recieved from extech could someone let me know if this is possible. I am starting to think that extech is withholding information on how to program this instrument because the command protocol seems like it is missing information. Please help someone am I crazy. Thanks for the help.


Extech Protocoll.pdf:
http://forums.ni.com/ni/attachments/ni/140/31586/1/Extech Protocoll.pdf

[smercurio_fc]

Is that all of the documentation? In the VI you posted (in the <a href="http://forums.ni.com/ni/board/message?board.id=140&amp;message.id=31587" target="_blank">other thread</a>) you have some bytes, but other than 2A I cannot find the other byte values in the documentation you provided.