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The data link escape character was intended to be a signal to the other end of a data link that the following character is a control character such as STX or ETX. For example a packet may be structured in the following way STX ETX. Miscellaneous codes. RS232 Protocol Legamaster e-Screen PTX-6500 Display Adjustment Back Light Brightness BRI W/R 0100 Current value 42 52 49 Digital Brightness Level BRL W/R 0100 Current value 42 52 4C Back Light ON/OFF BLC W/R 00: Off 01: On 00: Off (Back Light) 01: On (Back Light) 42 4C 43.
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