Serial interface with rapi protocol

[MarcelloeMaria]

Hi everyone,

i have to do a serial interface between labview and my arduino USB2 converter   , using com 3.

I do this block diagram but doesn't work. Any suggestion??

best regards,

Thanks 

Ciao Marcello

[GerdW]

Hi Marcello,

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@MarcelloeMaria wrote:

Any suggestion??

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Get rid of BytesAtPort, it's wrong here!

Implement error handling to give better descriptions than just "does not work"…

[MarcelloeMaria]

HI GerdW KNIGHT OF NI,

I try to remove  BytesAtPort, but give me error " VISA read:Contains unwired or bad terminal".

my goal is realize serial comunication between Labview and OpenEvse (https://www.openevse.com/kits.html) to be able to control it using  Rapi protocol.

The problem that i encounter is that:

i run the project but communication  does not work, the command  written on the write buffer is not received from OpenEvse and consequently nothing appears on the read buffer.

i try serial comunication between Putty  and OpenEvse and it works.

Best Regards

Marcello e Maria

[GerdW]

Ciao Marcello e Maria,

you still have to connect a numeric value to "bytes to read".

Did you look into any thread about serial communication in this forum? You really should!

You configure the serial port to wait for a TermChar: provide a value to "bytres to read" larger then the expected number of bytes in the message. VISARead will automatically read the full message as soon as the TermChar is received…