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V530-R160
Operation Manual
SE
C
T
IO
N
8
Se
rial
Int
e
rf
ac
e (Hos
t Link)
SECTION 8
Communication with the Host
Output Format
On execution of reading, the reading data is saved in the Write Area of the programmable con-
troller in ASCII code.
• In the host link mode, there are restrictions on the volume of communications data that can be
sent at one time.
The maximum volume of data is as follows. The reading data after the 56th letter are ignored.
• Letters of the alphabet: 56 letters
• When reading is NG, error codes are output to word +1.
• If the reading data consists of an odd number of bytes, a space (ASCII code 20) is inserted.
For error code details, refer to
Error Messages and Corresponding Corrective Actions
in
Section
9, Troubleshooting
.
Refer to page 257.
Write flag
Reading data
Description
+0
+1
+2
+27
+28
Writing
start word
Data
0
0
0
Write flag
Reading data
Reading data 3rd byte
Reading data 2nd byte
Reading data 4th byte
Reading data 53rd byte
Reading data 55th byte
Reading data 54th byte
Reading data 56th byte
Write flag switches between [0] [F] each time data is output.
Monitoring changes in the status of this bit makes it possible to determine
whether data has been written. Since the bit status becomes "0" after the final
measurement, save "F" as the initial value.
