Brooks Automation
278580 Revision A
47
LF80C ZeniD RFID Reader
7 Operation
Product Manual
7.2 Operation of the ASC-I1 Protocol
X - Read data
Command X starts the reading of a transponder.
If there is no tag in the reading range of the antenna, the reader returns an
error message (error 4 - no tag).
Data item "Page" can have the following values.
1)
'E' respectively 'F' in ID Bit 0...3 of the reading ID
If there is no tag in the reading range of the antenna, the reader repeats
the reading before an error message is sent out. The number of repeats is
defined in
Î
Parameter 4 (0x04).
No acknowledgment is expected from the host.
In case of a read request for more than one page (value 98 or 99), the
protocol is repeated. For the end of reading the reader sends an additional
package. The message includes the command 'x' and the source address
'0'...'E'.
If the reading fails, the reading is repeated in the defined time frame (
Î
Parameter 3 (0x03);
Î
Parameter 4 (0x04)). If it fails again, the reader
sends an error message 'no tag(4)' to the host.
If the sensor check is activated, the status of a floating contact connected
to the external input is checked before a reading process (writing process)
is triggered. If it is not connected, the error message "NOTAG" is sent;
otherwise the read process is started.
Value
Description
'01' to '17’
read page#
’98’
read more pages until end character or empty
character
1)
’99’
read entire tag data
Host
→
Reader
CMD
Reader ID
Page
X
1 byte
2 bytes
Reader
→
Host
CMD
Reader ID
Page
Data
x
1 byte
2 bytes
16 bytes
