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4.1.1
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>
4.1.2
Incorrect instruction / error codes
If a command is not entered correctly, the reader sends one of the following error codes:
wrong instruction:
<NAK> #00 <CR>
wrong value
:
<NAK> #02 <CR>
EEPROM error:
<NAK> #03 <CR>
inputbuffer overflow:
<NAK> #05 <CR>
wrong mode for instruction:
<NAK> #07 <CR>
4.1.3
Upper and lower case
The instructions set isn’t case sensitive.