Precisa 490 Series - Page 80

Precisa Gravimetrics AG Index c2 A74
Series 490
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
N.C. M-TXD M-CTS VDC GND M-RXD M-DTR EXTBUS N.C. M-TXD M-CTS VDC GND M-RXD M-DTR EXTBUS FRAME FRAME
35072414a.SCH 14-06-99
______ ______
VCC
VCC
GND GNDGND
GND
GND
GND
GND
VDC
C8 100nF
C9 100nF
C7
100nF
D1 1N4448 D2 1N4448
D3
1N4448
L2 L1
R8 47R
R5 47R R6 47R
R7 47R
R3 100k
R4
10k
Q1
BC337
JP1
HEADER 9
1 2 3 4 5 6 7 8 9 JP2
HEADER 9
1 2 3 4 5 6 7 8 9
C12 33pF
U1 MAX202
1 3 4 5 14 7 13 8
11 10 12
9 2 6
C1+
C1-
C2+
C2-
TD/R
RTS/R
RD/R
CTS/R
TD/T RTS/T RD/T CTS/T V+ V-
C10 100nF
C11 100nF
S_RXD S_DTR
S_TXD
S_IDTR
S_CTS