Serial I/O on the Parallax GPS Receiver. Open-drain?

Phil Pilgrim (PhiPi)

I'm looking at the SX/B source code for the GPS Receiver firmware to see if it's safe to use with the Propeller as-is. I notice that it uses a baudrate setting of "T4800". The GPS's I/O pin is bidirectional and pulled up to Vdd with a 4.7K resistor. That feature notwithstanding, the "T4800" setting will drive the pin both high (to 5V) and low, whereas "OT4800" would drive the pin only low. The latter would have been a better choice, not only for interfacing to the Prop, but also for any bidirectional comms, where the potential for bus conflicts is ever-present.

So here are my quesitons:

1. Is the firmware, dated "20 FEB 2006" the latest firmware being delivered with the GPS unit?

2. If it's been updated, has the Baud setting been corrected for open-drain output?

Thanks,
-Phil

Post Edited (Phil Pilgrim (PhiPi)) : 11/12/2008 10:49:28 PM GMT