Epson TM U200D Technical Reference - Page 65

DIP switch read circuit There are 8 switches in DIP switch bank 1 and 2 switches in DIP switch bank 2 that are status readable switches. Each signal is input to the CPU. The signal is read as LOW when the switch is On, and HIGH when the switch is Off. CPU (U5) pin 52 to 55, pin 56 to 59, and pins 1 and 81 are also used for the Motor, carriage drive circuit, Motor, paper feed drive circuit, and operation panel control circuit. The pins are used to read DIP switches temporarily immediately after the printer initialization (or the power is turned on). {5V ( (*11)) U5 52 P20 53 P21 54 P22 55 P23 56 P90 57 P91 58 P92 59 P93 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 DSW1 1 234 56 78 1 P57 80 P56 D24 D23 D22 D21 D20 D19 D18 D17 {5 V {5 V 3 P100 R33 Q38 {5 V R29 Q39 4 P101 R32 Q28 Q36 Q35 DSW2 12 D14 D25 Figure 2-23 DIP switch read circuit (*1): Resistance between E and B is used for pull-up resistors in the transistor. 2-24 Mechanism Configuration and Operating Principles Rev.B