0DH — Carriage Return
Control Code 0DH causes the logical print head to move to the left margin without any motion or printing activity. Therefore, to initiate printing you must send a line feed with the carriage return. If you send configuration Option 23 for line feed on carriage return, the buffer contents will print when a carriage return is sent.
With Configuration Option 23 and 28
If you set Configuration Option 23 to 23.0 (CR=0 line feeds), the carriage return will not cause printing, and therefore, the underlining feature (Configuration Option 28) will function properly. However, printing will be delayed until you add underlines to the buffer in the desired character positions.
When you load the buffer with characters and underlines, printing will begin with the next line feed when sent by the host computer. This activity will result in a line printed with the appropriate characters underlined as shown in Figure
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