Quote:
Originally Posted by yash101
Excuse my kinda curious nature, but I debug my RasPi using a serial UART connection. I just wire the TX and RX backwards and it works. What is the difference between UART and TTL? Aren't they a similar protocol?
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The RasPi and VEX Cortex's UART are using the same voltage levels (3.3V). The GPS is using RS-232 which runs at 12V and would fry the VEX. The MAX3232 chip converts the voltage levels so the two can talk without damaging anything.