I know for x850 and for x960, but not for x880. I think it need some hardware modifications.
Anyway, sys settings for x850 with RTA-3000.
[tmc]
enable_subscription="1"
saved_config_available="1"
saved_config_classname="NMEA_GPSTMC_ROYALTEK"
saved_config_portname="COM"
saved_config_port="4"
saved_config_baud="38400"
auto_tuning="1"
saved_last_frequency="931"
saved_last_tuning_mode="1"
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