Canon BJ-230 - Manual (Page 72)

DIP switch Function
12 ON Epson LQ printer control mode
1 ON A4-size paper
4 ON 12-inch page length
5 ON Graphics character set
8 ON United Kingdom character set
11 ON Sans serif typeface
NOTE: Unlike some previous Canon printers, internal fonts are
available only through software commands. They cannot be selected
through the operator panel nor the DIP switches. This is only an issue
for some MS-DOS applications and some custom software.