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 3. GQ EMF EF Meter RF Spectrum Power Analyzer
 Why is GQ-390 data download so slow?
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sprezzatura

Canada
14 Posts

Posted - 02/06/2020 :  12:13:41  Show Profile  Reply with Quote
When my program sends a "<SPIR...>>" command, I get a burst of 224 (sometimes 288) bytes immediately.

Then, there is a 24-second delay, and I get about 2,560 more bytes.

Finally, a total of 4096 bytes after 42 seconds. That's the equivalent of about 878 Baud... on a 115,200 Baud line? What on earth is it doing?

878 Baud = 4096 * (8 data bits + 1 stop bit) / 42 seconds.

So what you're saying is that the only way to determine that the entire log has been transmitted, is to perform a loop asking for a preset amount of data at each iteration (ex: 4096), and sit there and wait for a minute or more, each time, until nothing more is received?

There's gotta be a better way :o)
Reply #1

EmfDev

1133 Posts

Posted - 02/06/2020 :  12:59:48  Show Profile  Reply with Quote
There is probably something wrong with your software. The EMF-PRO software is using SPIR commands to get 4096 bytes of data each request and it doesn't take that long.
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Reply #2

sprezzatura

Canada
14 Posts

Posted - 02/07/2020 :  10:02:30  Show Profile  Reply with Quote
Looks like you're right: the GQ Pro software downloads 177,717 bytes in 2:22 min, which is 11,263 Baud (bits per second). Although that's still pretty slow.

My software is generic USB/Serial protocol. It just sends a <SPIR>> and sits there and waits.
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