Intermec EasyCoder 501 - Page 164

163Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 20 Serial Interface Board
+5V
P5
GNDC
74AC14
2 1
IC3A
P2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
GNDC
TXDA
RXDA
RTSA
CTSA
DSRA
GNDI
DTRA
TXDA
RXDA
RTSA
CTSA
DSRA
GNDI
DTRA
F1
F2
F3
F4
F5
F6
F7
GNDC
P2
26
27
GNDC
P5
26
27
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
GNDC
TXDB
RXDB
RTSB
CTSB
DSRB
GNDI
+20M1
–20M1
+TXD
–TXD
+20M2
–20M2
+5VEXT
+RXD
DTRB
–RXD
TXDB
RXDB
RTSB
CTSB
DSRB
GND
+20M1
–20M1
+TXD
–TXD
+20M2
–20M2
+5VEXT
+RXD
DTRB
–RXD
*
F12
F13
F14
F15
F16
F17
F19
F20
F21
F22
F23
F24
F29
F25
F26
F28
GNDC
1
2
Z2
R3
+12VA
–12VA
1
2
Z1
R1
+12VB
–12VB
R2
R4
5
6N139
2
IC6
6
8
3
7
R13
GNDGND
/RXDCL
R11
R10
D2
R12
+RXD
–RXD
5 –TXD
6N139
2
IC5
6 +TXD
8
3
7
R9
R5
74AC14
3 4
IC3B
/TXDB
+5V
R17
R16
Q2
/RTSB
74AC14
11 10
IC3E & F
13 12
GND
+5V
C1 – 4
GND
UNUSED CIRCUITS
20.5 Circuit Diagram B
Serial Interface Board 1-971703-40