EUCHNER FSA Light - Manual (Page 12)

Manual EKS Light and Light FSA
4 Operating states
Information!
Various operating states are available, depending on the EKS Light version.
Refer to section 1.1 Use of the manual to check which operating state your device supports.
The operating state determines the function of the system, which comprises the read station (also referred to as
device below) and Electronic-Key. The operating state defines the scheme according to which automatic
Electronic-Key recognition functions and how an access level is issued.
The operating state is set using DIP switches on the read station. The various operating states are stored in the
device software (firmware). The value for the operating state is also programmed on the Electronic-Key. Values
in the Electronic-Key and in the device must match.
What is the same in all operating states?
 Parity bit comparison in the device. The parity bit is used to check the values set within the DIP switch. By
this an accidentally reset or faulty DIP switch can be recognized.
 Matching of the EKS Light data block on the Electronic-Key with the set values in the device. This also
includes a comparison of the checksum (CRC). The checksum is stored on the Electronic-Key. After the
Electronic-Key is inserted, the checksum is calculated in the device and compared with the value on the
Electronic-Key. Access is released only if the values agree. The checksum is formed using the programmed
EKS Light data block required for the operating state and the serial number of the Electronic-Key. Like the
serial number, the checksum is therefore also a unique number. The cyclic redundancy check routine
prevents data manipulation outside of the defined software environment.
0958
01…32
FB 3B
07
Electronic-Key memory structure
Byte no.: 0 … … … 115 116 … 123
Function: freely available
Operating State, Access Level,
Access Code
EKM CRC
(dynamically
generated by EKM
software)
Serial number
(cannot be changed)
- EKS Light data block Blocked data
Some parameters and functions vary from one operating state to the next, e.g.:
 The EKS Light data block may have a different length, depending on the operating state.
 Therefore, the start byte in the programmable memory area of the Electronic-Key can be in a different
location, depending on the operating state.
 Different evaluation options of the DIP switch coding and the programming of the EKS Light data block on
the Electronic-Key.
Furthermore, additional functions are available in the individual operating states. Please refer to the respective
section.
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