Mitsubishi Electric GT16, User Manual

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61. MICROCOMPUTER CONNECTION (SERIAL)
61.5 Message Formats
61 - 21
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CONNECTION T
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MURA
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CONTROLL
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MI
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OMPUTER
CONNECTION (SE
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MICR
OCOMPUTER
CONNECTION (E
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HE
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MO
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US(R)/
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CONNE
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MO
DBUS(R)/
TCP
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V
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CONNECTION
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Details of data items in message format
POINT POINT POINT
Data code during communication
Communication is performed in ASCII code. (excluding interrupt output)
(1) Control codes
(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.
61.5.2 List of commands
(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.
61.4 Device Data Area
(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.
■ Message format(5)Read clock data (TR) command
■ Message format(6)Set clock data (TS) command
(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:
■ Error code list
Symbol
ASCII
code
Description
STX 02
H
Start of Text (start marker of message frame)
ETX 03
H
End of Text (end marker of message frame)
EOT 04
H
End of Transmission
ENQ 05
H
Enquiry (start of enquiry)
NAK 15
H
Negative ACK (error response)
ACK 06
H
Acknowledge (write completion response)
LF 0A
H
Line Feed
CL 0C
H
Clear
CR 0D
H
Carriage Return