User's Manual

Rev 09
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3.1.1 Entering instructions
The protocol format is as follows
Command <SP> parameter <CR>
The space character <SP> separates commands from parameters and the <CR> character acts as
command line terminator.
For commands without parameter values (e.g. GT ) the <SP> character and parameter values are
omitted. The command line is as short as this:
Command <CR>
3.1.2 Output format
Generally, every input terminated by <CR> is acknowledged by the reader. The following response
protocols are different:
3.1.2.1 Instruction specific output
After entering a valid command without a parameter value, the system answers by sending the param-
eter value and <CR>. Example:
Command: GT <CR>
Output: Transponder number or No Read <CR>
3.1.2.2 Output after changing a parameter
After entering a valid command together with a parameter value, the system answers by sending the
parameter value and <CR>. Example:
Command: MD <SP> 2 <CR>
Output: 2 <CR>
After entering an invalid parameter value, the system answers with the corresponding error code. Error
message:
Command: MD <SP> 4 <CR>
Output: NAK <SP> #02 <CR>