Hitachi EH-150 Applications Manual page 61

(2). Receiving area
The receiving area can be specified only by "ASR I/O Area (Connection N) Setting" in EH-ETH2 Configurator.
The receiving area can be defined every ASR connection. Available I/Os are word I/Os except WX.
Receive Area Information
No. I/O Top
1 WR 0
Figure 7.4
Caution
- 1 connection can handle up to 1454 bytes.
- When received data size is less than designated receiving area size, the rest area is not overwritten. The
previous data is kept.
- When received data size is bigger than designated receiving data size, the excess area is omitted
automatically.
Receive Area Information
No. I/O Top
1 WR 0
Figure 7.5
Receive Area Information
No. I/O Top
1 WR 0
Figure 7.6
Chapter 7 Automatic Sending/Receiving function (ASR)
EH-ETH2
Receiving buffer
Size H00 DT1
10 H01 DT2
H02 DT3
H03 DT4
... ...
H12 DT19
H13 DT20
20 Byte
Receiving area and receiving buffer (1)
Receiving buffer
Size H00 DT1
10 H01 DT2
H02 DT3
H03 DT4
... ...
H0E DT15
H0F DT16
16 Byte
Receiving area and receiving buffer (2)
Receiving buffer
Size
H00 DT1
10 H01 DT2
H02 DT3
H03 DT4
... ...
DT31
H1E
H1F DT32
32 Byte
: excess data
Receiving area and receiving buffer (3)
7-3
CPU module
I/O Receiving area
WR0 DT1
WR1 DT3
WR2 DT5
WR3 DT7
...
...
WR8 DT17
WR9 DT19
10 Word
I/O Receiving area
WR0 DT1
WR1 DT3
... ...
WR6 DT13
WR7 DT15
WR8 DT(n+1)
WR9 DT(n+3) DT(n+2)
10 Word
: Previous received data
I/O Receiving area
DT1
WR0
WR1 DT3
WR2 DT5
WR3 DT7
... ...
DT17
WR8
WR9 DT19
10 Word
DT2
DT4
DT6
DT8
...
DT18
DT20
DT2
DT4
...
DT14
DT16
DT(n)
DT2
DT4
DT6
DT8
...
DT18
DT20