79
Details of the Data Exchange Methods
Section 6-3
The following example is for a C200HX/HG/HE PC.
6-3-3
Data Exchange Method No. 3
Single-bit or multibit data is read/written during the I/O refresh period from
either the ASCII Unit or the CPU Unit.
PC PUT
The ASCII Unit converts decimal data to hexadecimal data and stores it at
allocated word IR/CIO n + 6. It writes decimal values from –32768 to 32767.
1,2,3...
1.
PC PUT command executed.
2.
The ASCII Unit writes data during the I/O refresh period.
The ASCII Unit is on standby
during the transfer.
CPU Unit
ASCII Unit
2. Via PC WRITE command
At I/O refresh
255 words max.
None
DM 0200
0201
0202
1.
20 words max. per cycle (except as shown below)
127 words max. per cycle (C200HX/HG/HE or CS1-series PC
and number of transfer bytes per cycle
is 127 words at DM m + 4 in the Setup
Area)
PC WRITE "@D, 200, 3, S3H4"; B (1)
B (1)
B (2)
B (3)
2. I/O refresh
2. I/O refresh
At PC PUT
n + 6
bit 03
CPU Unit
ASCII Unit
None
At PC PUT
1.
1.
n+6
0000000011110001
15
0
0000000011110001
PC PUT A%
BIT ON A%, 3
A%=0
15
0
n+6
PC PUT 241
n+6
15
8 7
3
0
15
8 7
3
0
n+6
1
1
Summary of Contents for C200H-ASC11
Page 1: ...C200H ASC11 ASC21 ASC31 ASCII Units Operation Manual Revised June 2000...
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Page 4: ...vi...