DIP switch settings for Epson T88IV and TMU220B printers
TM-T88IV – Serial
DSW1: 7 on and all others off
DSW2: all off
TM-T88IV- USB, Ethernet, Parallel
DSW1: all off
DSW2: 8 on and all others off
TMU220B – Serial
DSW1: all off
DSW2: 2 on and all others off
TM-U220B- USB, Ethernet, Parallel
DSW1: all off
DSW2: 2 and 4 on and all others off