Справочник Пользователя для Bourgogne ET Grasset SAS VEGRDE2
Vegas Long Range Read/Write Device
27-07-2002
Vegrde3/EG
Confidentiality Level 1
Page 20 (48)
Bourgogne et Grasset -– ZI Beaune Savigny -– 21200 Beaune – France – Tel. +33 380 26 26 26 – Fax. +33 3 80 26 26 00
3.3.12. ReadAllSnr
A
Reads all Serial numbers of Data Carriers in the active antenna field. This command is also
called the fast command A.
Serial protocol:
HOST - CORE MODULE
called the fast command A.
Serial protocol:
HOST - CORE MODULE
0x02 0x9B BCC
Read/Write Device – HOST
Data[0] ....... Data[n+1]
For every tag present you should receive 7 bytes from the reader:
0x06 Status Snr snr snr snr BCC
When no more tags are found you receive 5 bytes from the reader:
0x04 Status
Collisions[0]
Collisions[1]
BCC
Status – Equal to 0 if command completed with no error, to –3 if no tag was found or some other
error code if at least one tag was found but the command stopped because of an error during
execution.
False Collisions - Can be caused by detuned antennas or electromagnetic influences. Their effect
is mainly to increase the read time. Including this information in the response helps in adjusting
the external environment.
3.3.13. ReadAllSnr
B
Reads all Serial numbers of Data Carriers in the active antenna field. This command is also
called the fast command B.
Serial protocol:
HOST - CORE MODULE
called the fast command B.
Serial protocol:
HOST - CORE MODULE
0x03
0x9C
Block Flag/Page Number
BCC
Block Flag/Page Number – Bits 0-6 indicate the page address. Bit 7 is set to 0 for page access, to
1 for block access. In case that no page or block retrieval is desired, this byte should be set to 0.
Read/Write Device – HOST
1 for block access. In case that no page or block retrieval is desired, this byte should be set to 0.
Read/Write Device – HOST
Data[0] ....... Data[n+1]