User's Manual

Product Manual - RFID Reader UF70 Certum 66
Chapter 7
Operation
UMW – Write data
range of all EPC
transponders
masked
The UMW command starts to overwrite the defined data range of all EPC
transponders located in the field. Several EPC transponders can be located in the
write area of the antenna when using this command.
1) These data are displayed in the order listed for each identified EPC
transponder.
2) The response of the transponder is optional and only appears at result "00".
3) The result and Ex flag is only available in the first transmitted message in
messages with several frames.
Example: The EPC transponder masks 1 data word of the EPC code, rewrite
>> M01
<< m00000010106BBCC99AA7788556633441122
 EPC: 2211443366558877AA99CCBB
>> UMW01000000000102000000011111FFFF
<< umw00000010106BBCC99AA778855663344112200
>> M01
<< m00000010106BBCC99AA7788556633441111
 EPC: 1111443366558877AA99CCBB
Example: The EPC transponder masks 2 data words of the EPC code, rewrite
>> UMW0100000000010200000002AABBCCDD0F0F0F0F
<< umw00000010106BBCC99AA778855663344111200
>> M01
<< m00000010106BBCC99AA778855663C4D1A1B
 EPC: 1B1A4D3C66558877AA99CCBB
Host reader
CMD
Reader
ID
Head
ID
Access
word
Memory
bank
Memory
address
Number of
data words
Data
words
Mask
UMW 1 byte 1 byte 8 bytes 2 bytes 8 bytes 2 bytes N*4 bytes N*4 bytes
Reader host
Overhead response telegram
2)
Data of the participating EPC
transponders
1)2)
CMD
Reader
ID
Frame
ID
Result
3)
Ex flag
3)
Extensions EPC
Transponder
error code
umw 1 byte 2 bytes 2 bytes 2 bytes 0-12 bytes (2n+1)*2 bytes 2 bytes