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Is there any performance difference between using RTK on COM2 (RS422) or COM4 (RS232)?

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Is there any performance difference between using RTK on COM2 (RS422) or COM4 (RS232)?

No difference. Both ports send out a $GPGGA message at 1 Hz – and the message is sent on to the RTK network – and then an RTCM3 message is received back through the port.