- class garmin.T001(phys, link, command)
This protocol is undocumented, but it appears to be a transmission protocol according to the GPS Manager (gpsman) application (https://sourceforge.net/projects/gpsman/).
This feature is undocumented in the spec. The implementation is derived from Appendix C: Changing the baud rate in Garmin mode in the GPS 18x Technical Specifications (https://static.garmin.com/pumac/GPS_18x_Tech_Specs.pdf)
- static desired_baudrate(baudrate)
Return the desired baudrate.
Asynchronous protocols do not allow for much tolerance. The relative baudrate error tolerance for UART with 8N1 configuration is only ±5%.
However, since both transmitter and receiver may not generate the exact baudrate, the error must not exceed ±5% in total, which in the worst case (one too fast, one too slow) imposes a tight allowed deviation of +2.5% and -2.5% on the modules respectively. We therefore choose ±2.5% tolerance.
Change the baudrate of the device.