Index count n of serial stream parameter

ArduPlane Plane 4.6
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1

Hello everyone!
I have a question about the stream rates (SRn_EXT_STAT, SRn_EXTRA1, SRn_EXTRA2, etc.):
Does the index n refer to the serial port?
This would mean that SR3_EXT_STAT has no meaning, as SERIAL3_PROTOCOL = 5 has been set for the serial interface 3 for GPS.

See example:
SERIAL0_PROTOCOL = 2 (Mavlink 2) / SR0_ EXT_STAT
SERIAL1_PROTOCOL = 2 (Mavlink 2) / SR1_ EXT_STAT
SERIAL2_PROTOCOL = 2 (Mavlink 2) / SR2_ EXT_STAT
SERIAL3_PROTOCOL = 5 (GPS) / SR3_ EXT_STAT
SERIAL4_PROTOCOL = 2 (Mavlink 2) / SR4_ EXT_STAT
SERIAL5_PROTOCOL = 2 (Mavlink 2) / SR5_ EXT_STAT

Or does the index n refer to the Mavlink interface, as in the following example:
SERIAL0_PROTOCOL = 2 (Mavlink 2) / SR0_ EXT_STAT
SERIAL1_PROTOCOL = 2 (Mavlink 2) / SR1_ EXT_STAT
SERIAL2_PROTOCOL = 2 (Mavlink 2) / SR2_ EXT_STAT
SERIAL3_PROTOCOL = 5 (GPS)
SERIAL4_PROTOCOL = 2 (Mavlink 2) / SR3_ EXT_STAT
SERIAL5_PROTOCOL = 2 (Mavlink 2) / SR4_ EXT_STAT

Thanks for your time

2

SRx is used when the protocol of the corresponding serial port is set to mavlink 1/2

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