EUCHNER CIS3A-Mini - Manual (Page 15)

EUCHNER Identsystem CIS3A-Mini
084727-01-02/03 Subject to technical modification Page 15 / 22
5 Commands for reading the data carrier read-only
Read operations are always initiated by the host control (PC, PLC) with a "command
telegram".
The ident system then sends a response telegram to the control.
Control Ident system CIS3...
Command telegram
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Response telegram
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IMPORTANT !!!
Please note:
The data carrier read-only contains a unique 5-byte serial number. This number is
lasered-in during the production process of the data carrier and is stored absolutely
indestructible. The serial number is used for secure distinction of every single data
carrier. For this secure distinction it is necessary to evaluate all 5 bytes completely.
5.1 Read operation
Command telegram (telegram core, PLC ® CIA3SX, see also figure 7):
TL (read/write head address) (start address) (number of bytes user data)
Response telegram (telegram core, CIA3SX ® PLC, see also figure 8 or figure 9):
There are two different possible responses for this command
1. RL (read/write head address) (start address) (number of bytes user data) (user data)
or
2. RF (read/write head address) (0,0)(status no.)
The response telegram RL (see also figure 8) means error-free reception of the data.
If it is not possible to read a data carrier, an RF response telegram is received
(see also figure 9). The status number then indicates the cause of the error.