Manual EKS Ethernet TCP/IP
Page 32/38
Subject to technical modifications
2547185-01-10/22
8.3 Commands for writing and reading an Electronic-Key read/write
Write and read processes are always initiated by the PC/control system using a “command message.”
The command message and reply message are also packed as user data in the TCP/IP frame.
The Electronic-Key-System then sends a reply message to the PC/control system.
PC/control system
Electronic-Key-System
Command message
Reply message
Information!
On the Electronic-Key read/write with 116 bytes freely programmable, the memory is organized in 4-
byte blocks. This means the start address for writing must be given in the range byte number 0 to byte
number 112, always in 4-byte steps (byte number 0, 4, 8 ... 112). Also, a multiple of 4-byte-sized blocks
must always be written (4, 8, 12 ... 116 bytes)!
However, during reading it is possible to access the memory byte-by-byte without the above-mentioned
restriction for writing.
The Electronic-Key read/write also has a unique 8-byte serial number that is permanently written to the
memory during the Electronic-Key production process. The serial number therefore cannot be changed.
This serial number is used for secure differentiation of every single Electronic-Key. It is necessary that
all 8 bytes are completely evaluated for secure differentiation. The serial number is appended to the
freely programmable memory. The serial number can be read by entering the start address byte number
116 and the number of bytes 8.