Circuit Diagrams - Intermec EasyCoder 501 Service Manual

Chapter 20 Serial Interface Board
20.5 Circuit Diagram A
P4
X1
1 AD4
2 AD3 AD0
AD1
3 AD5
4 AD2 AD2
AD3
5 AD6
6 AD1 AD4
AD5
7 AD7
8 AD0 AD6
9 CSX0 AD7
10 CSX1
11 XINT
CSX1
12 WR
WR
13 RD
RD
14 X0
/DTRA
15 X1
16 NMIHPC
A4
17 +5.3V
A3
18 GND
A2
20 A4
A1
21 A2
22 A3
IC3C
23
19 /RESET
5
24 A1
25 74AC14
26 GND
C17
Y1
C16
3.6864 MHz
IC1
32
X1/CLK RXDA
TXDA
33
X2
34
RESET RXDB
CSX1 35
CS TXDB
WR 8
WR
RD 9
RD I 6
X1 21
INT I 5
I 4
A4 6
A3 I 3
A3 5
A2 I 2
A2 3
A1 I 1
A1
1
A0 I 0
AD7
19
D7 07
AD6 22
D6 06
AD5
18
D5 05
AD4 23
D4 04
AD3 17
D3 03
AD2 24
D2 02
AD1 16
D1 01
AD0 25
D0 00
88C681/40
162
RN2
1
10
+5V
2
5
3
6
4
7
9
8
47k
RN1
1
8
+5V
9
10
5
3
7
6
4
2
47k
6
GND
31
/RXDA /RXDA
30 /TXDA
/TXDA
10 /RXDB
11
/TXDB
37
/DSRB
38 /DSRA
39
GND /DSRA
2 GND
36
GND
4 /CTSB
7 /CTSA
/CTSA
15
26
14
27
/DTRB
13 /DTRA
28
/DTRA
12 /RTSB
29
/RTSA
/RTSA
Serial Interface Board 1-971703-40
IC2
C5
+
1 +
+10V
CEXT
3
–
C7
20
+
–10V
CEXT
+
18
–
/TXDA
11
/RTSA 13
/DTRA 15
/RXDA
16
/CTSA 14
1
/DSRA
12
MC145407
P6
D3
+5.3V
+
C21
GND
C11
P3
/RXDCL
3
/RXDB
1
2 /RXDRS
/TXDB
/DSRB
/CTSB
/DTRB
/RTSB
Intermec EasyCoder 501 – Service Manual Ed. 7
+5V
C6
+
+12VA
17
–12VA +5.3V
4
+
C8
GND
TXDA
10
8 RTSA
6 DTRA
RXDA
5
CTSA
7
DSRA
9
*
+5.3VEXT
IC4
C9
+
1 + 17
+10V
CEXT
3
–
4
20 +
–10V
CEXT
+
18
–
/TXDB
11 10
/RTSB
13 8
/DTRB 15 6
/RXDRS 16
5
/CTSB 14
7
1
/DSRB
12 9
MC145407
/TXDB
IC3D
R7
X1
9 8
74AC14
/RTSB
+5V
D1
+
C20
GND
+5V
C10
+
+12VB
–12VB
+
C12
GND
TXDB
RTSB
DTRB
RXDB
CTSB
DSRB
XINT
Q1
GND GND