Euchner Electronic-Key Adapter with serial Interface Bedienungsanleitung PDF herunterladen (Seite 18)

Manual EKS Electronic-Key Adapter serial

088796-02-03/05 Subject to technical modifications Page 18/24

8.4 Commands for writing and reading an Electronic-Key read/write

Write and read processes are always initiated by the PC/PLC (control system) using a "command message".

The Electronic-Key-System then sends a reply message to the control system.

PC/PLC (control system) Electronic-Key-System

Command message

−→

Reply message

←

On Electronic-Keys read/write with 116 bytes, the memory is organized in 4-byte blocks. This means a

multiple of 4-byte sized blocks must always be written.

The start address must be given in the range byte number 0 to byte number 112, always in 4-byte steps

(byte number 0, 4, 8 ... 112)!

However, during reading it is possible to access the memory by bytes without the above mentioned

restriction during writing.

8.4.1 Write process

When this command is used, the Electronic-Key must be in the Electronic-Key adapter and is only

allowed to be removed from within the operating distance after reception of the reply message.

Command message (message core, PC/PLC → EKS, see Figure 2):

 TP (device addr.) (start addr. user data) (number of bytes of user data) (user data)

Reply message (message core, EKS → PC/PLC, see Figure 3):

 RF (device addr.) (00

hex

,00

hex

) (status number)

Contents

Byte no. Description

ASCII hexadecimal decimal

0 Number of message bytes 0B ... 7B 11 ... 123

Command identification

3 Device address 01 1

Start address for the user data

00 ... 70

0 ... 112

6 Number of bytes of user data 04 ... 74 4 ... 116

7 ... 122 User data ASCII or hexadecimal or BCD (code transparent)

Figure 2: Command message write Electronic-Key read/write (message core)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24

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Euchner Electronic-Key Adapter with serial Interface Bedienungsanleitung Seite 18