Pioneer PDU-50WX2, Service Manual

Page: 63 / 95

63
PDU-50WX2
6.4.4 Adjustment with the RS-232C Command
Terminal
TXD0 (35 pin: TXD0)
RXD0 (36 pin: RXD0)
REQ_MD (38 pin: P60)
Terminal
Specifications
TXD0 : Data output
RXD0 : Data input
REQ_MD : H/L output
Control Main microcomputer
• Communication between main microcomputer and module microcomputer
Communication protocol of RS-232C is as follows:
• Clock asynchronous serial communication
• LSB first
• Start
: 1bit
• Data : 8bit
• Parity : 0 (No parity)
• Baudrate : 38400bps
Numeric value direct validity : When transmit a number after the command, adjustment value is able to set directly.
UP/DOWN validity
: When transmit the "UPn" or "DWn" (n=0, 1, ... , 9 or F) after the adjust command, ups and downs of the
adjustment value are possible.
Data is an alphanumeric character mark of ASCII notation (do not perform distinction of a large letter and a small letter).
The consecutive transmission is maximum three commands
Operation of the numeric value direct valid command
STX (02hex) ID (2byte) Command (3byte) ETX (03hex)
STX (02hex) ID (2byte) Command (3byte) Command (3byte) Command (3 byte) ETX (03hex)
STX (02hex) ID (2byte) Command (3byte) Numeric data (3byte) ETX (03hex)
Communication Protocol
Adjustment Function
Data Format
RS-232C Communication
• Perform the command processing in the order that input.
• Ignore the information of this ID 2 bytes because the module microcomputer does not perform process with ID.
• After the command reception, convert a total value of transmit data except STX, ETX, ID into 2 bytes of hexadecimal number
as checksum (CS from now on), and transmit it.
STX (02hex) CS (2byte) ETX (03hex)
• Transmission method of checksum
When an error occurred between ETX from STX, stop the process after a concerned command, and clear the reception buffer.
Error Processing
Command Processing