RCH
INSTALLATION AND MAINTENANCE MANUAL model TOUCH ME
- 46 -
8. TOUCH ME SYSTEM ARCHITECTURE
The device is composed of a CPU that controls the following peripheral devices inside the
housing: Display, Keyboard, Printer, Fiscal Memory, Rs232 Serial Ports. The interface
connector to the MMC is accessible from the outside.
The CPU installs
a microprocessor (X1) M16624 connected to an x (X2) 128KB SRAM
memory by means of a A0-A17, D0 - D7 bus.
S0 and SI serial lines are dedicated to the
reading and writing of the fiscal memory (EEprom 128KB).
By means of some pilot drivers and appropriate control circuits, the microprocessor
controls the following external CPU
utilities: a change-holder drawer
and a thermal printer.
The CPU receives control information from the following sensors: TERM for controlling the
temperature of the printer head, PA-R for controlling the presence of paper for printing the
receipt.
The keyboard is directly controlled by the microprocessor (X1), and is composed of an 8 x
6 line matrix. A scanning signal is generated on the 6 C-0 C-5 lines, while the 8 R0-R7
lines receive information when one of the keys are pressed.
The LCD modules (display devices) are controlled by the (X-1) microprocessor through the
LCD D0-D3 lines. Each module uses a dot matrix.
For connecting to the peripheral units, the device is equipped with two serial interfaces
type RS232C. The microprocessor directly controls the serial ports through two MAX232
interface circuits (X11 and X12).
