Communicate Extech 421509

[MeCoOp]

I'm trying to communicate with the Extech 421509 thermocouple datalogger.  I'm communicating via serial.  I've found a few example on the web but I'm not getting the result I'm hoping for.  My goal is to retrieve the logged data from the instrument.  I have the protocol for communication but I'm not really sure what it all means.  I've tried various configurations with no luck.  I've attached a copy of my code and the command sets for the instrument.  Thanks in advance.

[nyc_(is_out_of_here)]

Did you notice   Communication Protocol : 2400,E,7,1

[J-Barticus]

Hello,

After doing a little bit of research on the Extech 421509, reading the User's Manual, and looking at your provided VI/protocol page, I have some feedback/questions for you.

What results are you getting and how do they vary from your desired results?

It appears that you are trying to read in the "Saved Data" in your VI, however you mention the desire to read in the "Logged Data" - these are two different functions/memory locations as mentioned in the user's manual. Additionally I did not see any command in the provided protocol page or the user's manual for reading the "Logged Data".

According to the user's manual there is a CD/software provided with the Extech 421509 that does exactly what you are looking to do. There are instructions on using this software in the user's manual. I believe this software is availabe for download on the instruments product page.

-Jake B.

[MeCoOp]

Hi Jake,

The double precision float indicator gives 65535, and the number indicator gives 4294967.

You are correct I am trying to retrieve the logged data, I didn't realize they were different memory locations.

This project sprung up because I coudlnt' get their software to work on my computer.  I could tell the interface was written using LabVIEW so while waiting for tech support to get back to me I was trying to develop my own solution.  Turns out their program doesn't work on Windows 7 machines so I had to run it in an instance of virtual XP.  I would still like to figure it out if possible.