Service manual

SRP-150
Rev. 1.02
- 34 -
4-3-3 Cash Drawer Circuits
1) Cash Drawer Driving Circuit
The circuit is used for opening cash drawer and driven by the 2SD2170. When its state is high level signal,
2SD2170 drive the solenoid to open the cash drawer. As an optional item, we provide sensor switch (we call
it a compulsory switch) which checks the drawer whether it is opened or not. This sensor switch turns on for
the drawer open condition, and turns off for the other.
Caution : ※ Make sure that the Cash Drawer solenoid resistance is more than 20Ω.
Figure 4-3-3 Cash Drawer Block Diagram
4-3-4 RS-232C Communication Block Diagram
The CPU is used for serial communication. And also RS-232C Driver (MAX232), is used to serial
communication. Show following block diagram.
Figure 4-3-4-1 RS-232C Communication Block Diagram
RXD,DSR
TXD,DTR
UPD70F738