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HF Multi ISO RFID Reader User Manual, Firmware V1.4 

 

1508-USM-00-0-04 

 

This command sends and receives my-d™ plain and secure commands including my-d™ secure 
algorithm. 

‘z’ 

Downlink length (1 byte) 
Option byte (1 byte)  
[UID (8 bytes)]  
my-d™ data (n bytes) 

Data 

Status byte: 00h (1 byte) 
Data without MAC and CRC (n bytes)  

This byte is mandatory. It will define the length of the my-d™ data frame sent to the reader. The 
MAC, CRC and the framing overhead is not included. 

The option byte defines general behavior of the command. 

Note that ISO 14443 tags are only working in selected mode. 

7 

If set the MAC is calculated and added to the frame 

6 

If set the tag is in addressed mode. The UID is following as first 8 bytes after 
the option byte. The my-d™ frame is following. 

5 

If set the tag is selected. No UID is needed. 

4 – 0 

RFU 

Data is sent as my-d™ plain command. It contains only data that is processed by the MAC 
calculation. If the tag is addressed, only valid with ISO 15693 tags, with its UID the first 8 bytes 
are interpreted as UID and not included into the MAC calculation. 

MAC calculation is done automatically if according flag is set. The ISO 15693 or the ISO 14443 
frame is completed and the CRC is computed and added automatically. 

The commands Write Page, Restricted Write and Write Byte do not need any MAC verification for 
the answer. 

  

 

 

August 2010 

 

Page 89 of 144 

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