Mitsubishi Electric GOT2000 Series Connection Manual page 98

■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 2-digit ASCII code (Hex) and transmitted from the upper digit.
For details of the commands that can be used, refer to the following.
➠
(3) Address
Specifies the head No. of the device data to be read/written.
The address notated in decimal 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.
➠
(4) Number of points
Specifies the number of device data to be read/written. (Setting range: 1 to 64)
The address notated in decimal is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
(5) Year, month, day, hour, minute, second and day of the week data
Specifies year, month, day, hour, minute, second, and day of the week to be read/set to the GOT clock data.
The address notated in decimal is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
➠
➠
(6) Data
Specifies the data to read from/write to the specified device data.(word unit)
The address notated in hexadecimal is converted to a 4-digit ASCII code (Hex) and transmitted from the upper digit.
(7) Error code
This is the response message at faulty communication appended with error contents.
Error code is transmitted in 1 byte.
For details of the error codes generated in format 2 (GOT-A900 Series microcomputer connection (format 2)), refer to
the following:
➠ ■4.
2 - 36
2.5 Message Formats
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
2.5.2 List of commands
2.4 Device Data Area
■ Message format (5) Read clock data (TR) command
■ Message format (6) Set clock data (TS) command
Error code list
Description