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(3) Random read in word units (RR) command
The following shows an example of reading the two points of the virtual devices D100 and M0 to M15.
(Assuming D100=0064
Item
Request message
(host
GOT)
Response message
during normal
communication
(GOT
host)
(format 1: GOT-A900 Series microcomputer connection (format 1))
Response message
during faulty
(format 2: GOT-A900 Series microcomputer connection (format 2))
communication
(GOT
host)
61 - 26
61. MICROCOMPUTER CONNECTION (SERIAL)
61.5 Message Formats
, M0=1are stored.)
H
D100
M15 to 0
STX
Command
Address 1
R
R
0
1
02
52
52
30
31
H
H
H
H
H
(H)
(L)
(H)
–
Sum check is performed in this range.
Sum check is performed in this range.
STX
Data 1 (D100)
0
0
6
02
30
30
36
H
H
H
H
(H)
–
–
NAK
15
The above is a case where
the sum check error (06
has occurred.
0064
H
0001
H
Message format
Address 2
0
0
8
3
2
30
30
38
33
32
30
H
H
H
H
H
–
(L)
(H)
–
–
(L)
Data 2 (M15 to 0)
ETX
4
0
0
0
1
34
30
30
30
31
03
H
H
H
H
H
(L)
(H)
–
–
(L)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
1
1
1
1
1
1
9
8
7
6
5
4
3
2
1
5
4
3
2
1
0
NAK
15
H
Error
code
06
H
H
)
H
Sum
ETX
Check
0
3
5
03
33
35
H
H
H
H
(H)
(L)
Sum
Check
8
E
38
45
H
H
H
(H)
(L)
1
M
0
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