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NI visa read serial looses a lot of data

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A baud rate that high would demand short cable length and premium quality cables, I would think.  Are you sure the hardware isn't the issue?

Bill
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@billko wrote:

A baud rate that high would demand short cable length and premium quality cables, I would think.  Are you sure the hardware isn't the issue?


Meaning that you should find some low capacitance cable with a matched impedance for the serial method being used.  (RS-232, RS-423, RS-485,...)

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@RTSLVU wrote:

What's with all the "sync byte" stuff? I have never seen anything like that before...

 


...

 

SDLC uses Sync Bytes to frame packets. SDLC was an alternative to Ethernet developed by IBM back in the day. But it used a "7E" as the sync bytes so this is something different.

 

Ben

Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel
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Thank you! This has solved my problem.

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@RTSLVU wrote:

What's with all the "sync byte" stuff? I have never seen anything like that before...


Sounds like you have only used ASCII message protocols.  When dealing with binary/hex/raw message protocols, you need to have a start character, some way to tell how long the message is, and typically a checksum or CRC or some sort.  This is more common than you would think since it is a more efficient protocol, just harder for people to understand.


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@crossrulz wrote:

@RTSLVU wrote:

What's with all the "sync byte" stuff? I have never seen anything like that before...


... more common than you would think since it is a more efficient protocol, just harder for people to understand.


Not to mention "bit-stuffing" where the control characters are not allowed in the data stream so extra bits are stuffed in where needed to prevent those characters from appearing in the data stream.

 

Ben

Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel
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