Fire-Lite PRN-6 Reference-Manual - Manual (Page 95)

If “ENQ/STX” is selected in the menu, the XON/XOFF protocol is active in
the background. If graphics printer sequences or sequences containing
05 hex. or 02 hex. are sent to the printer, theses values are treated as
ENQ or STX. Thus the programmer must ensure that ENQ (05 hex.) or
STX (02 hex.) only appear in the data flow in their status enquiry function.
ETX/ACK Protocol Also here the X-ON/X-OFF protocol works in the background. Additionally
after receipt of an ETX (03 hex, end of text) character an ACK character
(06 hex, acknowledge) is sent fromt the printer to the computer.
Jumper settings 4
B
Serial interface RS232C/V.24
B - 7
BACK QUIT
?