Cant read serial port from Erickson power instrument.

[wasa1]

Im trying to read data from my power instrument(usb to rs232). But I cant understand how to convert the data I receive to readable data.

I read the manual for the instrument but I cant understand how to convert the data in labview. Please help.

[crossrulz]

1.  It does not look like you are sending the command properly.  The command needs to be 8 bytes long.  You are missing the 4 data bytes and the Carriage Return.  Digging more into the document, it states that the DS query should have 0 for the data bytes of the command.  If you change the display mode for your string constant to "\ Codes", you can easily set the data bytes to 0 (use \00 for each byte) and add the Carriage Return (\r).

2. After sending the command, you need to read 1 byte to reach the ACK.

3. The description for how to interpret the data starts on page 21 of your manual.  It gets a little complicated and I don't have time to go through it all myself.  But you can use Status Byte 3 to get your range and apply the data bytes (count) and the max value of the range to the equation on page 21 to get your reading.

[billko]

I think it's pretty awesome that the OP uploaded both the VI and the manual.  Made life much easier for everyone.  🙂

[wasa1]

Thanks for the respons but the Erickson pm4 blew up for some reason when I turned it off and on. Luckely we had a PM5 which VDI (Virginia Diodes) had a ready made program for, I can now measuere power output. But thanks again!