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