IBM 3174 Reference Manual page 45

Using 3270 Printers as ASCII Printers
Table 2-10 (Page 2 of 2). ASCII Control Codes
Character
Hex Code Action Taken
US
X'lF'
Carriage return, line feed
VT
X'OB' New line
XON (DC1) x ' l r
Resume sending
XOFF (DCS)
X'13'
Stop sending
Advanced ASCII printer capabilities, such as underscoring, programmable fonts,
and color, are not supported.
Some ASCII printers send status indications to the host when detecting conditions
such as lack of paper, buffer full, and broken parts. The 3174 gives an indication,
using flow control indicators, that its buffer is full or that it is not ready to print, but
does not otherwise send status to the host. The 3270 printer hold print control
stops the host from sending data if the host supports flow control.
2-18 3174 Establishment Controller Terminal User's Reference for Expanded Functions