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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. yT ) the <SP> character and parameter values are
omitted. The command line is as short as this:
Command
<CR>
3.1.2
Output format
yenerally, 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>
