Serial Port Error code

[Sam.Huang]

Hi all

   I want to communicated with Serial Port Send command and get right as below snapshots:

 1) I used to Serial_assist Tools when power on get initial message from product and send"AT+SELFTEST=TEST" get right code.

 How to use labview set up serial port ignored first time initial message and send"AT+SELFTEST=TEST" get right code.

[GerdW]

Hi Sam,

two notes:

• Don't use local variables when the terminals are unused next to them!
• Don't use BytesAtPort!

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@Sam.Huang wrote:

How to use labview set up serial port ignored first time initial message and send"AT+SELFTEST=TEST" get right code.

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Setup the port, send your command and receive the answer - without local variables and without BytesAtPort!

[Sam.Huang]

Hi GerdW

  Thank you for you reply,I changed it as you mention get as before,if other need to setup it,thanks!!

[GerdW]

Hi Sam,

no need for that wait function, the VISARead will wait for 512 bytes (or TermChar) anyways!

Do you have a manual of your device describing the comm protocol? You need to follow the guidelines written in there like:

• When the device sends two messages you need to read both.
• When the device sends a "binary" message you maybe cannot use a TermChar.

Read the details in your manual!

[Sam.Huang]

Hi GerdW

   It's a earbuds product,client provide baudrate and cmmand"AT+SELFTEST=TEST",then back command as“;g-sensor:OK;P-sensor:FAIL;PPG:FAIL;has_dc:OK”.

The problem is when power on with the earbuds,will out a initial message,first time send command and get wrong measage, hold on power send command again will get right meassage.

I think that if ignored inital message and clear it then send command will get right code,but I don't how to configured it,could you give a idea for this,thanks!!

[GerdW]

Hi Sam,

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@Sam.Huang wrote:

I think that if ignored inital message and clear it then send command will get right code,but I don't how to configured it,could you give a idea for this,thanks!!

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Read the initial message, then send the command and read its response.

So you need VISARead (maybe with timeout error handling), VISAWrite, VISARead…