Appendix A Hardware Hardware This chapter describes the hardware of this product. Interface Signal Wiring Block Diagram The following shows the interface signal wiring block diagram of DM-D500 and DP-501. Display Display CPU DSW2-1 Level shifter Switched by Display connector Modular-8 TXD DP-501 Connector for display connection Modular-8 D-Sub 25 (female) connector RXD (3) TXD (3) for host connection DTR (20) DSR (6) D-Sub 9 (male) connector for printer connection RTS (4) Connection switched by JP1 and JP2 JP2 JP1 TXD (2) 1 2 3 1 2 3 RXD (2) DSR (6) DTR (4) RESET (25) RESET (9) 61 DSR DTR