Microcom 238B Operator's Manual page 197

The following is the list of ^D commands in numeric order:
^A ^D COMMAND
2 Text String Entry Mode: Precedes the text strings that are supplied to the
various fields in the format (Equivalent to ^B).
3 Print Command: Prints a single label or starts the printing of a batch of labels
(Equivalent to ^C).
5 Send Printer Status: (Equivalent to ^E).
7 Update printer flash: This command is used to update the printer's software
which includes the application, the bootloader, and the embedded fonts.
8 Cycle the cutter: This command makes the cutter cycle once.
11 Print Test Pattern: (Equivalent to ^K).
12 Print Blank Label: (Equivalent to ^L).
X 20 Set Bits Per Second: The 238B uses a parallel based USB device so
setting the serial baud rate does not have any effect. The machine will run as
fast as possible.
0 110 bps
1 150 bps
2 300 bps
3 600 bps
4 1200 bps
5 2400 bps
6 4800 bps
7 9600 bps
8 19200 bps
9 38400 bps
10 57600 bps
11 115200 bps
12 230400 bps (only used for D149 Image Mode)
13 460800 bps (only used for D149 Image Mode)
14 921600 bps (only used for D149 Image Mode)
13-6 238B Operator's Manual - 880053-0101