Command Protocol - Pioneer PDP-4270XA Service Manual

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9.1.3 COMMAND PROTOCOL

A
Communication protocol
Start bit length
Data width
Parity
Stop bit length
Baud rate
Regulating function
Direct numerical value effective: The adjustment value can be set directly by transmitting the figure to the mark of the
Data format
The control signal format sent from the user side controller is as follows. When the transmission data is completed STX
B
(02 (Hex)), the command of ETX (03 (Hex)) is arranged when beginning to communicate. And, ID, the command, and the
parameter are arranged between those. Data is assumed to be ASCII form alphanumeric character. Neither the capital
letter nor the small letter are distinguished.
• Only for the command
STX
0x02
Command processing
When the command is input, the command processing begins processing.
C
ID is assumed to be 2 asterisk "∗∗".
Reception confirmation
The module microcomputer judges right or wrong for the command received from the main side.
If it is an effective command, processing is executed. And, the reply of the received command is done when entering the
following state of the command standby after processing is completed.
The replying data replies data that deletes the ID code from the reception command by the capital letter.
• When you accompany setting/adjustment data
Send data to PC
STX
D
0x02
• Only for the command
Send data to PC
STX
0x02
In this case, "ERR" replies if it is a command of the uncorrespondence.
The command replies "XXX" when processing on status cannot be executed even if it is effective.
E
Processing in the case of an error
When the communication error occurs from STX between ETX, the processing of a pertinent command is discontinued, and
F
the reception buffer is cleared. When STX is received, the command reception processing keeps storing the transmitted
character string in the register.
And, the character string placed by the ETX reception between STX-ETX is interpreted as a command.
142
1
2
: Asynchronous serial communication by RS-232C
: 1 bit
: 8 bit (ASCII codes/There is no distinction between the capital letter and the small letter)
: None
: 1 bit
: 9600 bps (Fixed)
command.
ID Command ETX
∗∗
0x03
ID Command Parameter
∗∗
ID Command ETX
∗∗
0x03
• For an Invalid command
Send data to PDP system
STX ID Command
∗∗
0x02
• For the command that cannot be executed on status
Send data to PDP system
STX ID Command
∗∗
0x02
2
3
• When you accompany setting/adjustment data
STX ID Command
∗∗
0x02
Receive data
ETX STX
0x03 0x02
Receive data
STX Command
0x02
Receive data
ETX STX
0x03 0x02
Receive data
ETX STX
0x03 0x02
PDP-427XD
3
4
Parameter ETX
0x03
Command Parameter ETX
0x03
ETX
0x03
Command ETX
ERR 0x03
Command ETX
XXX 0x03
4