Pioneer CLD-V5000 Programmer's Reference Manual page 62

3.7.7 Input/Output Device Control Commands
53) INPUT UNIT REQUEST
Function: Reports input data from the remote control unit.
Format: # I
Explanation: The RCU input data is always returned as two ASCII-HEX codes.
After several buttons are pressed, the latest digit will be returned.
Once the data has been read out and no buttons are pressed, "No
Key" (FF) is returned until the next remote control input is made.
Execution: * No RCU button previously pressed
# I <C/R>
* Key Input
# I <C/R>
* The last digit is returned, in this case, "7".
54) INPUT NUMBER WAIT
Function: Awaits digit input data from remote control.
Format: ? N
Explanation: When this command is entered, the player returns the first digit
that is entered through the remote control (0-9). Only one digit is
returned and any other character or non-digit button is ignored.
Execution: * RCU
? N <C/R>
* Digit 1 Input
Note: To regain control of the player if no button is pressed, use the CLEAR
command.
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CLD-V5000 Level III • Chapter Three
LD/CD
FF <C/R>
23517
07 <C/R>
LD/CD
1 <C/R>
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CLD-V5000 Level III User's Manual