FlexRadio Systems Tuner Genius XL User Manual page 36

Alternatively, you can use a BCD connection between the eight‐pin DIN (Band Data) connector on the Yaesu
transceiver to the Band Data A or Band Data B (DB15) connector on the tuner. The restriction described in
section 6.3.1.4, Band Data and Frequency Measurement based restrictions, applies in this case.
BCD connections use a custom cable configured as shown in this diagram.
i – Optocouplers protect all serial and digital inputs or outputs on the Tuner Genius XL
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