Data Exchange Method No. 2 - Omron C200H-ASC11 Manual

Details of the Data Exchange Methods
6-3-2

Data Exchange Method No. 2

PC READ@
CPU Unit
None
DM 0300
0301
0302
PC WRITE@
78
The ASCII Unit independently reads/writes the CPU Unit memory during the I/
O refresh period.
The ASCII Unit reads the CPU Unit memory as specified in the PC READ@
command.
1,2,3... 1. PC READ@ command executed.
2. The ASCII Unit reads data during the I/O refresh period (the ASCII Busy
Flag goes ON).
3. When the PC READ@ command data transfer is completed, the ASCII
Busy Flag goes OFF.
The following example is for a C200HX/HG/HE PC.
2. Via PC READ command
At I/O refresh
The ASCII Unit writes to the CPU Unit's internal I/O memory, as specified in
the PC WRITE@ command.
1,2,3... 1. PC WRITE@ command executed.
2. The ASCII Unit writes data during the I/O refresh period (the ASCII Busy
Flag goes ON).
3. When the PC WRITE@ command data transfer is completed, the ASCII
Busy Flag goes OFF.
ASCII Unit
PC READ "@D, 300, 3, S3H4"; B (1)
B (1)
B (2)
255 words max.
B (3)
ASCII Unit on standby
until here.
20 words max. per cycle (except as shown below)
127 words max. per cycle (C200HX/HG/HE or CS1-series PC and when
1.
number of transfer words per cycle is 127
words in DM m + 4 in the Setup Area)
Section 6-3