I am trying to interface with a Lakeshore 331 temperature controller via GPIB. I was able to install the appropriate driver and simply read the temperature via the Instrument I/O Assistant. I would like to of course control the temperature setpoint and heater power via labview as well. However, when I select the write command I get a write input box in the Instrument I/O assistant box. I tried to connect a numeric control to the "write" box. However, I am still unable to write anything.
Sorry if my question is too vague or simple. I know pretty much nothing about labview.
Thanks a lot for your help.
Also, I get a response with the GPIB address number (12) when I 'ping' the device in MAX so I know it is communicating properly.
You should also be able to use VISA Interactive in MAX to communicate with the instrument.
Thanks for your response nyc. Unfortunately, I am unable to read or write to the temp controller with VISA.
I also face difficulty to connect lakeshore 331 temperature controller with RS232 port to a PC with USB port. I use an adapter to make the connection and the driver for the port is working well. I tried to communicate with the instrument via NI MAX. At first I got the following error VISA: (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it. Later when I tried to send *IDN?\n command I got next error like this VISA: (Hex 0xBFFF0015) Timeout expired before operation completed. I use the port setting which is recommended in the device manual. Still I cannot solve the problem.