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Transport/Locate command set
The US-224 contains a set of standard transport switches: REW, FFWD, STOP, PLAY, and REC.
In addition, dedicated status LED's are used to communicate the current transport state to the
user. The LED's indicate REW, FFWD, PLAY, and REC. (Note that there is no LED to indicate
STOP.) Additionally, there are three locate switches, which can be used to set and locate to
markers established on the host application's timeline. SET is intended to be used as a SHIFT
key, along with either the < or > button to drop a marker at the application's current time.
US-224 to Host Messages (transmitted at button-down):
• TRANSPORT_REWIND
o Button-down: BF 13 7F
o Button-up: BF 13 00
• TRANSPORT_FFWD
o Button-down: BF 14 7F
o Button-up: BF 14 00
• TRANSPORT_STOP
o Button-down: BF 15 7F
o Button-up: BF 15 00
• TRANSPORT_PLAY
o Button-down: BF 16 7F
o Button-up: BF 16 00
• TRANSPORT_REC
o Button-down: BF 17 7F
o Button-up: BF 17 00
• LOCATE_LEFT (non CS-10)
o Button-down: BF 18 7F
o Button-up: BF 18 00 7.
• LOCATE_RIGHT (non CS-10)
o Button-down: BF 19 7F
o Button-up: BF 19 00
• SET_LOCATE (non CS-10)
o Button-down: BF 1A 7F
o Button-up: BF 1A 00
Host to US-224 Messages (transmitted when host transport-state changes:
• UPDATE_TRANSPORT_LED:
o State is REWIND: F0 4E <UNIT> 12 01 13 <STATE> F7
o State is FFWD: F0 4E <UNIT> 12 01 14 <STATE> F7
o State is STOP: F0 4E <UNIT> 12 01 15 <STATE> F7
(Note: US-224 has no STOP LED: message is defined for future devices)
o State is PLAY: F0 4E <UNIT> 12 01 16 <STATE> F7
o State is REC: F0 4E <UNIT> 12 01 17 <STATE> F7
Where:
• <UNIT> is device ID. Should be transmitted as 0 for now.
• <STATE> == 0 turns LED OFF
• <STATE> == 7F turns LED ON