Teac US-224 - Manual (Page 41)

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US-224 to Host Commands:
DATA_WHEEL (identical to JL Cooper CS-10)
a. BF 60 vv, vv = 2's complement using 7 data bits
Host to US-224 Messages:
UPDATE_ASN_LED: F0 4E<UNIT> 12 0F<STATE> F7
where
<UNIT> Transmit as 0 for now.
<STATE> is either 0x00 (LED OFF) or 0x7F (LED ON)
.