Installation Guide

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8 Basic data exchange process
The master has to send an software command to start an read or write process of the reader. After doing
all the necessary work at the readers site, the result of the reading or writing process or an failure code
is sent back to the master.
If there is used an read/write transponder, only the serial number of the transponder will be read if the
basic read command „Get Tag“ („GT <CR>“) is applied.
The data exchange of the whole memory can only be done, if the reader is set to the Mode 2 ( „selective
Read (RD) “ and „write (WD)“).
8.1 Selective read RD
• Start the reader with the command RD plus parameters (plus <CR>). You can read out just one
block (with one parameter) or several blocks (with two parameters, first and last block number).
• Wait for the answer
• Analyse the received answer: 8 characters plus <CR>. Allowed characters 0 to F.
The NoRead code is set to ( „XXXXXXXX“).
The result of the reading process may also be seen at the LED’s.
• LED L2 lit, if there was a successful read.
• LED L3 lit, if there was a No Read.
Example: RD <SP> 20 <CR> read block 20
RD <SP> 16 <SP> 33 <CR> read all blocks from 16 to 33
Allowed values (block numbers of the transponder IC):
ALGO 9 (1 kBit; P4150, P4450, P4550) 3 ... 33
ALGO 6 (2 kBit; Hitag 1) 16 ... 63
ALGO 14 (2, 4; kBitEM4305, EM4569) 5 … 15