Mitsubishi Electric GOT2000 Series Connection Manual page 139

■2. Details of data items in message format
(1) Control codes
Symbol
STX
ETX
EOT
ENQ
NAK
ACK
LF
CL
CR
(2) Command
Specifies the contents to access from the host to GOT.
The command is converted to a 1-digit ASCII code (Hex) and transmitted.
For details of the commands that can be used, refer to the following.
➠
2.5.2 List of commands
(3) Station No.
Station No. is used to identify the GOT with which the host communicates. (Setting range: 0 to 31)
The address notated in decimal is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
The GOT processes only commands whose station No. matches the "Host Address (0 to 31)" set at "Communication
Detail Settings". (The message of command whose station No. does not match is ignored.)
For setting method of "Communication Detail Settings", refer to the following.
➠ 2.6.1 Setting communication interface (Controller Setting)
(4) Address
Specifies the head No. of the device data to be read/written.
The address notated in hexadecimal is converted to a 4-digit ASCII code (Hex) and transmitted from the upper digit.
For details of the device range that can be accessed, refer to the following.
➠
2.4 Device Data Area
(5) Bit pattern
Specifies the pattern of the bits to change.
The address notated in hexadecimal is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
➠
■ Message format (3) Multi-point write in bit units (3) command (w/out station No.), multi-point
write in bit units (D) command (w/ station No.)
(6) Write specification
Specifies how to change the data of the specified address by bit pattern.
(Setting range: 0 to 3)
Data notated in decimal is converted to a 1-digit ASCII code (Hex) and transmitted.
➠
■ Message format (3) Multi-point write in bit units (3) command (w/out station No.), multi-point
write in bit units (D) command (w/ station No.)
POINT POINT POINT
Data code during communication
Communication is performed in ASCII code. (excluding interrupt output)
ASCII code
02H Start of Text (start marker of message frame)
03H End of Text (end marker of message frame)
04H End of Transmission
05H Enquiry (start of enquiry)
15H Negative ACK (error response)
06H Acknowledge (write completion response)
0AH Line Feed
0CH Clear
0DH Carriage Return
Description
2.5 Message Formats
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