NAD M55 - RS232 Circuit Diagram

NC
1
D5
2
D6
3
D7
4
RCLK
5
NC
6
RX
7
TX
8
CS0
9
CS1
10
CS2
11
BAUDOUT
12
NC
13
XTAL1
14
XTAL2
15
IOW
16
IOW
17
VSS
18
IOR
19
IOR
20
NC
21
DDIS
22
TXRDY
23
AS
24
NC
25
A2
26
A1
27
A0
28
RXRDY
29
INT
30
OUT2
31
RTS
32
DTR
33
OUT1
34
MR
35
NC
36
NC
37
CTS
38
DSR
39
DCD
40
RI
41
VCC
42
D0
43
D1
44
D2
45
D3
46
D4
47
NC
48
8
6&&,%
C2+
1
C2-
2
V-
3
R1IN
4
R2IN
5
R3IN
6
R4IN
7
R5IN
8
T1OUT
9
T2OUT
10
T3OUT
11
T3IN
12
T2IN
13
T1IN
14
R5OUT
15
T4OUT
16
R3OUT
17
R2OUT
18
R1OUT
19
R2OUTB
20
INVALID
21
FORCEOFF
22
FORCEON
23
C1-
24
GND
25
VCC
26
V+
27
C1+
28
8 0$;
VCC
5 5
5 5
/' /' /' /' /'
/'
/'
/'
VCC
0567
$8;
5' :5
5 0
5 .
<
0+=
% 3)
% 3)
/$
/$
/$
VCC
% 8)
%
8)
%
8)
% 8)
5
5
5 5
'&' '65 5;' 576 7;' &76 '75 5,
+5, +'&' +'65 +&76
+'75 +576
+7;' +5;'
1 2
3
4
5 6 7
8 9
- &2100
A
B
C
G2A G2B
G1 Y7
GND
Y6
Y5 Y4
Y3 Y2
Y1
Y0
Vcc
8
+&
/$ /$ /$ /&6
&3 5' :5
5 .
VCC
VCC
10.RS232 CIRCUIT DIAGRAM
3-42