Accessing FieldPoint Devices via serial port on FP-2010

[f2otba2l]

I'm trying to communicate to a FP-1000 with (4)AO-210's and (2)AI-100's (one for current and one for voltage)on it's bank via the serial port of an FP-2010 Ethernet Controller Module.

A previous entry indicated the I should use Express Optomux vi's. I can get the AO's to output correctly, but I can't get the AI's to measure correctly. Voltage and current readings on the AI's terminal blocks read correctly. I've used !F Optomux vi to get the output in the software.

I did connect my PC directly to the COM port on the FP-1000 to discover the FieldPoint serial devices using MAX. I set the voltage input ranges to 0-18V and the current input ranges 0-.024mA. The output of the !F vi is increasing less the actually supplied input. (ie. 1 V in, .57 measured....10V in, 5.67 measured). The vi is linked to a 4 channel indicator

I'm quite new to this type of programming and these devices. Thank you for your assistance.

Nick

[JaredA]

Hello Nick,

I'm think you may have already seen the relevant documents on this topic. But just in case...

How Can I Talk to an FP-1000 Using an FP-20xx?
Connecting FP-20xx to FP-1000 Using RS-232 Simultaneously

Make sure you have looked through the information on both of those knowledgebases.

Since you are getting some type of reading from your AI, it sounds like you're programming could be OK. What you should do is verify the voltage that is going to the AI is exactly what you think it is. You could use a hand-held DMM to check the value, or you could use a known voltage source like a battery and connect it to the AI channels. If you verify the value being fed in and you still see incorrect readings then you may want to start breaking down the problem such that you are only working with the AI-100. Once you get the AI working, you can then revert back to involving the whole system integration.

There are examples that get installed to LabVIEW when you have the FieldPoint driver. Depending on the version of LabVIEW you have, the examples should be found by going to Help >> Find Examples, and then in the Example Finder go to Hardware Input and Output >> FieldPoint >> Optomux and select an Analog Read example. If you cannot get the examples to work correctly then the problem is going to be with a hardware connection and you'll then have to troubleshoot your actual setup.

Post back to this forum if you have additional questions.

Jared A