Intermec EasyCoder 501 Service Manual page 164

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