ThingMagic M5e-Compact - Manual (Page 234)

Release Version 1.0.34
234 Appendix D: Deprecated and Modified Commands
Release Version 1.0.34
Read Tag Single (21h)
If a tag is read using the currently set tag protocol, its EPC is returned in the tag ID
section of the packet. If no tag is read, a fault code is reported. The Read Tag Single
command takes a 16-bit timeout value in milliseconds.
The following example shows a timeout of 1000 ms (0x03E8):
The response to this command is slightly different depending upon the number of bits in
the tag ID of the current protocol that is selected. The general response format is shown
here:
For example, the following response packet for an EPC0 64-bit tag is sent back. Notice
that the Tag CRC follows the tag ID field for all protocols:
Note
It is important to have a valid protocol selected. To select a protocol, use the
Set Tag Protocol command. This command will not work correctly if there
are multiple tags in the RF field, use the Read Tag Multiple command
instead.
FF 02 21 03 E8 D5 09
SOH Length OpCode Timeout (ms) CRC
FF M+2 21 00 00 M bytes ?? ?? ?? ??
SOH Length OpCode Status Tag ID TagCRC CRC
FF 0A 21 00 00 C8 05 07 A8 00 84 C4 FF 9E E0 F7 25
SOH Lengt
h
OpCod
e
Status Tag ID 1 Tag CRC
1.Tag CRC – Calculated on the tag ID field only.
2 CRC
2.CRC – Calculated on the entire message packet.