E--883--4N--E
1
12. OVERALL BLOCK DIAGRAM
Power
Flow input
1/1 output
Density input
Press. input
Te
mp. input
Analog outpu
t
Pulse output
1
Pulse output
2
Pulse output
3
Com port
Te
rminal
Bloc
k
Address path
Data path
P
o
wer Boar
d
Interface Boar
d
Comm
unication
Boar
d
CPU Boar
d
I/O Boar
d
Power Unit
Internal Power
low Input Ckt.
Dens. Input Ckt.
A/D
Converter
Press. Input Ckt. (analog)
Te
mp. Input Ckt. (analog)
Temp. Input Ckt. (Pt)
Analog Output Circui
t
Pulse Output Circuit
1
Pulse Output Circuit
2
Pulse Output Circuit
3
Multi plexer
Isolation
Te
st Pins
Te
st Pins
Internal
V
olt.
Buzzer
Motherboar
d
K
ey
boar
d
IC Car
d
128
×
128 dots
ST Displa
y
RUN
×
8 keys
Isolation
Isolation
Isolation
Isolation
Parallel I/O
Timer Counter
Parallel I/O
CPU
20MHz
Memory
RS485
Isolation
IC Card Interface Circuit
32.768kHz Real
Ti
me
Clock
Lithium Battery
Power Detect
Fuse
Isolation
Fi
g.
1
2.
1
O
ve
ra
ll B
lo
ck
D
ia
gr
am
