Oki 6E - Manual (Page 185)

B - 6
b) RS422 I/F parameter setting
Ready
OFF-LINE
Adobe PS
MENU 1
Menu 2
Keep key down for more than 2 seconds and bring the printer into menu
setting mode (level 2).
Next, press key, 8 times.
MENU 1
Menu 2
Ready
ENTER
PowerSave
Ready
Item BAUDRATE
Selection Function
300 300 baud
600 600 baud
1200 1200 baud
2400 2400 baud
4800 4800 baud
9600 9600 baud
19200 19200 baud
38400 38400 baud
Factory Setting: 9600 baud
RS422
SERIAL
Press key.