Re: Streams question

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

Hi Steve,

On 3/20/26 9:59 AM, Steven Hunt via Tech-talk wrote:

Hi we have a device that reads the following data over RS232

"000001 0000F9 0000 0000 0000 0000 0F 00 00<0d><0a>"

The data comes quite slowly, every 4 seconds (@ 9600 baud if I remember correctly)  via a port server , we were using the following proto file (simplified version)

Would this happen to be a Health Physics Instruments (HPI) device?

Circa 2013 I integrated an HPI 6016, which send out a similarly structured line at 1Hz.

Due to the circumstances of that moment, there was a focus on making this IOC "robust".  To the point that the repository below includes a simulator with fault injection.  I started out with asyn+stream as you have, but just could not make it handle weirdness properly.  So I ended up doing a custom driver.

https ://github.com/mdavidsaver/hpi6016

ReadTimeout = 1000;
Terminator = CR LF;

dose_rate {in "%x %*x %*x %*x %*x %*x %*x %*x %*x";}

This has been working well, but occasionally we get last character is missing.

StreamIoSuccess input="000001 00005A 0000 0000 0000 0000 0F 00 00<0d>", size=43)

Then catch it in the next buffer

.  

StreamIoSuccess input="<0a>000001 00005A 0000 0000 0000 0000 0F 00 00<0d><0a>", size=45)

 

We have tried many combinations of the proto file, changing timeout, ignore extra input etc, putting everything into a long char buffer ,,,,,   

Can anyone advise on the best protocol file entry to capture this type of data cleanly?

Steve