Serial Data Format sub second errors?

[biggins]

Hello,

I'm trying to process the serial data format, I've got the serial port set to output both the EMS and ADHRS data at 19.2k.

The time seems to back track in the fractional seconds spot. Here is an example stripped of the characters after the time:

b'!3222541111
b'!1122541113
b'!3222541214
b'!1122541200
b'!3222541201
b'!1122541203
b'!3222541204
b'!1122541206
b'!3222541207
b'!1122541209
b'!3222541210
b'!1122541212
b'!3222541213
b'!1122541315
b'!3222541300
b'!1122541302
b'!3222541303
b'!1122541305
b'!3222541306
b'!1122541308
b'!3222541309
b'!1122541311
b'!3222541312
b'!1122541414

when the fractional seconds get close to 15 the seconds flip over to the next full second before the fractional seconds reset.

I've attached a full file for review. Any ideas why this is happening?

 

[Dynon]

These are known to not be perfectly in sync. So it's "normal", although admittedly not ideal.

 

[biggins]

I threw in some code to catch and correct the error but leaving an error like this in your equipment is pretty bad form.