PDP-507XD
157
5678
56
7
8
C
D
F
A
B
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9.1.3 COMMAND PROTOCOL
Communication protocol : Asynchronous serial communication by RS-232C
Start bit length : 1 bit
Data width : 8 bit (ASCII codes/There is no distinction between the capital letter and the small letter)
Parity : None
Stop bit length : 1 bit
Baud rate : 9600 bps (Fixed)
Regulating function
Direct numerical value effective: The adjustment value can be set directly by transmitting the figure to the mark of the
command.
Data format
The control signal format sent from the user side controller is as follows. When the transmission data is completed STX
(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.
Command processing
When the command is input, the command processing begins processing.
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.
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.
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
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.
• Only for the command
• Only for the command
• For an Invalid command
• For the command that cannot be executed on status
• When you accompany setting/adjustment data
• When you accompany setting/adjustment data
STX ID Command ETX STX ID Command Parameter ETX
0x02 ∗∗ 0x03 0x02 ∗∗ 0x03
Send data to PC Receive data
Send data to PC Receive data
Send data to PDP system Receive data
Send data to PDP system Receive data
STX ID Command Parameter ETX STX Command Parameter ETX
0x02 ∗∗ 0x03 0x02 0x03
STX ID Command ETX STX Command ETX
0x02 ∗∗ 0x03 0x02 0x03
STX ID Command ETX STX Command ETX
0x02 ∗∗ 0x03 0x02 ERR 0x03
STX ID Command ETX STX Command ETX
0x02 ∗∗ 0x03 0x02 XXX 0x03
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