Circuit Diagram - Intermec EasyCoder 501 Service Manual

Chapter 21 RS-422/485 Interface Board

21.5 Circuit Diagram

P4
1 AD4 X1
2 AD3 AD0
AD1
3 AD5
4 AD2 AD2
AD3
5 AD6
6 AD1 AD4
7 AD7 AD5
8 AD0 AD6
9 CSX0 AD7
10 CSX1
11 XINT
CSX1
12 WR
WR
13 RD
RD
14 X0
/DTRB
15 X1
JUM3
16 NMIHPC
A4
17 +5.3V
A3
18 GND
A2
20 A4
A1
21 A2
22 A3
IC3C
23
19 /RESET 5
24 A1
74AC14M
25
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
170
RN2
1
10
2
5
3
6
+5V
4
7
9
/RXDA
8
47k
RN1
D1
1
+5.3V
7
9
+
C20
10
+5V
8
3
R5
6
5
IC3B
4
3 4
2
47k
74AC14M
6
IC3E
/TXDA
11 10
74AC14M
IC3A & F
/RTSA
1 2
13 12
74AC14M
GND
31
/RXDA
C12
30 /TXDA
10 /RXDB
C14
11
/TXDB
37 /DSRB
38
JUM1
39 JUM2
2
JUM3
36 JUM4
4
/CTSB
7 JUM5
15
/JUMEN
26
14
27 /DTRB
13
28
12
/RTSB
29
/RTSA
/JUMEN
RS-422/485 Interface Board 1-971708-40
IC10
1 3
+ +
U
5V 5V
C7
2 4
- -
REG.
+5V
IC4
R4
8 2
P3 P3 P3
7
3
6
5
6N136
VEE
IC5
2 8
7
3
6
5
6N136
GNDE
+5V
VEE
IC6
2 8
7
3
6
5
6N136
GNDE
IC2
C13
+ 1 17
+
+10V
CEXT
3
–
C15
4
20 +
–10V
CEXT
+
18
–
/TXDB
11
10
/RTSB 13 8
/DTRB 15 6
/RXDB
16
5
/CTSB 14
7
1
/DSRB
12 9
MC145407
+5V
R9
JUM1
1
R10
JUM2
3
JUM3
5
R11
X1
JUM4
7
R12
JUM5
9
P7
Intermec EasyCoder 501 – Service Manual Ed. 7
VEE
C8
VEE
GNDE
VEE
IC7
1 8
R
B
2 7
RE
3 6
DE
A
4 5
D
75176
GNDE GNDE
F1
GNDC
VEE
IC8
1
8
R
B
2
7
RE
F3
3
6
DE
A
4
5
D
75176 GNDC
F4
GNDE
GNDC
VEE
P8
P10 P10
P9
+5V
C1, 3, 4
GNDE
+5V
GNDC
F5
+
GNDC
F8
F6
GNDC
GNDC
+
F7
F10
GND
TXDB
GNDC
GNDC
RTSB
DTRB
RXDB
CTSB
DSRB
D2
+5.3V
+
P6
C19
XINT
IC3D
R7
9 8
Q1
74AC14M
P2
1
2
3
GNDC
4
5
6
7
8
GNDE 9
F2
10
11
12
GNDC
13
14
+RS422I
15
16
17
–RS422I
18
+RS422O 19
20
–RS422O
21
22
23
24
25
26
27
P11 P11
GNDC
P5
26
27
GNDC 1
TXDB 2
RXDB 3
RTSB 4
CTSB 5
DSRB 6
GNDI 7
8
9
10
11
12
F9
13
14
GNDC
15
F11
+5VEXT 16
17
18
GNDC
19
F12
DTRB 20
21
22
GNDC
23
24
25