Star Micronics DOT MATRIX PRINTER SP2000 - Manual (Page 58)

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(2) Precautions
Do not use the <ENQ>, <EOT>, <ESC>, <ACK> or <SOH> commands when
the automatic status is valid. You must first invalidate the use of the automatic
status function using the DIP switches or the <ESC> <RS> “a” n command to
use these inquiry commands.
(3) Method to Identify States
<Control Code> <Reception Data>
XON <00010001>B
XOFF <00010011>B
<Status> <Reception Data>
ENQ Status <***0****>B
EOT Status <***1***0>B
Automatic Status (First Byte <Header 1>) <0**0***1>B
Automatic Status (Second Byte and Beyond) <0**0***0>B
0 = indicates bit fixed to 0.
1 = indicates bit fixed to 1.
* = indicates bit changed.