Datamax-O'Neil DPL Programmer’s Manual - Manual (Page 179)

Appendix D – Reset Codes
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Appendix D
Reset Codes
The most common transmitted error codes are:
Uppercase “R”
This code is sent every time the printer is turned “On,” signaling a hardware reset.
Uppercase “T”
This code signals a software reset. A software reset is made by sending the command
sequence to the printer or by performing a reset using the front panel keys.