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Appendix 6 Universal Serial Communications
App6-31
Read CHR Command
When memory contents are in the form of characters when data is read, 1 character (1 byte) is
converted into 2-byte ASCII code and transmitted. However, when this command is used, contents
are not converted before transmission, and thus, the transmission time is decreased by approximately
1/2.
•
Read CHR command
Example:
Address: Call up 4 characters that are written at the top of 0020 (0014H).
- Host side
There should be no more than 5 DLEs.
Address:
Top address of the data memory to be read (HEX ASCII)
Count:
Number of characters to be read (HEX ASCII)
* When the data to be read is not continuous, “DLE” is inserted as a delimiter
between the breaks.
- V series side
Address and count are omitted and DLE and data are transmitted.
HL
A
d
d
r
e
s
s
A
d
d
r
e
s
s
C
o
u
n
t
C
o
u
n
t
D
L
E
R C
D
L
E
S
T
X
E
T
X
S
U
M
HL
D
L
E
D
L
E
S
T
X
E
T
X
S
U
M
Memory
data
Memory
data
Read CHR command
Host side
V series side
Transmission
data
Transmission
data
02
H
52
H
43
H
33
H
33
H
30
H
30
H
31
H
34
H
30
H
30
H
30
H
34
H
10
H
03
H
D
L
E
R C
0 0 1 4
0 0 0 4
3 3
S
T
X
E
T
X
02
H
31
H
46
H
41
H
42
H
43
H
44
H
03
H
10
H
D
L
E
A B C D
1 F
S
T
X
E
T
X
Host side
V series side
The “A,” “B,” “C,” and “D” character
codes are sent from the V series as
shown below.
Send data
Summary of Contents for V Series
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Page 317: ...App6 48 Appendix 6 Universal Serial Communications Please use this page freely...