Mitsubishi A953GOT-LBD-M3-H, Hardware Manual

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A953 HANDY GOT Connection to Microcomputer 12
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A
12.5.2 Data transfer format
There are two types of data transfer formats executed by commands.
The table below shows each data transfer format.
The data transfer format can be changed over using the utility function in the GOT.
For the details of the utility function, refer to the GOT-A900 SERIES OPERATING MANUAL
(EXTENSION FUNCTION/OPTIONAL FUNCTION FOR SW
†
D5C-GOTR-PACKE).
*1 When the format 2 is used, an error code is stored in the interrupt output.
The table below shows the contents of each error code.
Selected protocol Format 1 Format 2
Format while data is sent
(host
→
GOT)
Format of
response data in
normal status
(GOT
→
host)
When read
command (RD or
RR) is sent
When write
command (WD
or RW) is sent
Format of response data when error
has occurred (GOT
→
host)
Format of interrupt output
(GOT
→
host)
Error code Contents of error Action
06
H
Sum check error
An error occurred in the sum check after the
communication packet was received.
Check the communication line and the
send packet.
10
H
Command error
An unsupported request command was used. Confirm the data of the sent request
command.
11
H
Message length error
The data quantity is beyond the upper limit of
the receive buffer. Check whether the total number of
bytes of the send data packet is not
more than 518.
7B
H
Point over error
The range of read/written devices is exceeded.
Check the specified device range.
7A
H
Address error
The head address of the read/written devices
is outside the allowable range.
Check the head address of the
specified devices.
12
H
Communication message error
While a communication message was
received, EXT was not found until the upper
limit of the receive buffer was exceeded.
Check the communication message.
(02H)
STX Command
Data
(64 points
maximum) (03H)
ETX Sum
check
Sum check range
(02H)
STX
Data
(64 points
maximum)
(03H)
ETX Sum
check
Sum check range
(06H)
ACK
(15H)
NAK
(15H)
NAK
*1
Error
code
Interrupt
output data
(02H)
STX
(03H)
ETX
Sum
check
Sum check range
Interrupt
output data