User Manual

Medio S004 EVM
7.1.3 Trigger Input
When the trigger capability is enabled, a trigger state is used to start and stop the RF scanning.
The trigger is connected to the input of the reader.
Depending on the reply settings of the trigger, the ASCII message can be sent during the trigger
activity (Repeated Read mode and Read Once mode are available) or at the end of the trigger. In
this last case, a message is always sent to the host system:
 if a tag has been read, the message contains its ID,
 if no tag has been read, the message contains a No Message string (that can be defined)
as shown in Table 7.
Table 7: Customized ASCII Message Format (TAGSYS RFID Tag is not read)
Start of Text Header String
No Tag Found
String
End of Message
String
End of Text
Description
<STX>
(0x02)
“TAGSYS-“
(Default)
“????????“
(Default)
<CR/LF>
(Default)
<ETX>
(0x03)
Size
1
character
0 to 16
characters
0 to 16
characters
0 to 16
characters
1
character
Status Optional Optional Required Optional Optional
7.1.4 Output Settings
The output of the reader can be used to monitor the trigger activity or the successful reads.
28/33 Revision 1.1 October 2006