E-922-1-E
7
3.4 Instrument Internal Configuration Block Diagram
Constant
voltage unit
9
to
14
LED×4
Power supply
85 to 240 VAC
16 characters
x 2 lines
Comm. port
Terminal block
Display
Numeric Keypad
UART
CPU
ROM
32k
RAM
16k
RAM
16k
Card control
Magnetic
stripe
Non-contact
IC card
0 through 9, ., CL,
ENT, etc.
LED and switch
input control
LCD control
LCD
R S 4 2 2
o r
R S 4 8 5
Fig. 3.3