Spectra Precision ProFlex 800 Reference Manual - Manual (Page 222)

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Connection
Specify the radio used (“cable”, U-Link TRx,
Magellan UHF, Pacific Crest, ARF7474 A or B)
to transmit RTK corrections to the other rovers
located nearby.
BRD
Baud Rate Specify the baud rate to be used on the port. PRT
Mode
(Only if port A is used) Choose between RS232
and RS422 for port A, depending on the device
connected to it.
MDP
RTS/CTS Specify the handshake setting for the port. CTS
Parameter Designation $PASHS