And as I feared, the MGPS display is telling the truth, there is something wrong with the GPS module's ability to check the feed line for shorts and opens, and something wrong with the motherboard's ADC module.
At least the communication between the MGPS and the GPS engine is working properly... -Chuck Harris Chuck Harris wrote:
After chatting with John Miles, and Paul (ziggy), I was reminded that TTL RS232 is not a good thing around a pedantic protocol analyzer. 4V signal swings would work with the analyzer's strict +/-3V thresholds, except for that wonderful excuse for a UART that Trimble used, putting a big glitch dead center in each sent bit position. The protocol analyzer saw that glitch drop below 3V, and just knew it was a start bit. And, that coupled with using 9600,8,N,1 instead of Trimble's favorite 9600,8,O,1 settings made for the interesting data smearing I was seeing. Now, I am getting properly formed TSIP packets. Time to decode them and see what they mean. More later, -Chuck Harris
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