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Dif
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Se
ction 11
RFID System
User's Manual
(Modbus TCP)
Section 11
Appendices
Differences in Address and Size Specifications
between V680 and V680S Reader/Writers
RF Tag access for V680S-series Reader/Writers is performed in words (1 word = 2 bytes). RF Tag access for
V680-series Controllers is performed in bytes. Be sure to access data in the correct units.
The word and byte addresses for the memory map of a V680-D1KP
@@
RF Tag are given below as a concrete
example.
Because you cannot access data in bytes for a V680S-series Reader/Writer, you cannot, for example, read six
bytes of data starting from address (byte address) 0001 hex. In this case, you would have to read four words
from address (word address) 0000 hex and discard the first and last bytes at the host device.
Data is accessed in words for a V680S-series Reader/Writer. The smallest accessible unit is therefore one word (two
bytes).
Word addresses
Byte addresses
Data
0000 hex
0000 hex
0001 hex
0001 hex
0002 hex
0003 hex
0002 hex
0004 hex
0005 hex
0003 hex
0006 hex
0007 hex
…
……
01F2 hex
03E4 hex
03E5 hex
01F3 hex
03E6 hex
03E7 hex
1 byte
