Hi. I'm not a specialist in this area so I can be arbitrarily wrong, but I can google.
I've found that PSRF103 is a command for SIRF chips.
Code:
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And if you search for "SIRF" word on the following page you would start thinking that maybe GP-635T is not SIRF based.
Code:
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Also my intuition tells me that disabling some NMEA messages is not enough to increase the output rate and you should request the new baud rate by sending a specific command.
And, yes, 9600/5/8 = 240 is not enough for the NMEA message group if all NMEA messages are enabled.
My NMEA samples have ~400 chars per message group.
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