Intermec EasyCoder 501 - Uart1: Interface Circuits

141Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 17 CPU Board
17.6:9 "uart1:" Interface Circuits
GND
1213
IC08C & F
UNUSED CIRCUITS
5
74AC14M
74HC32M
5
6
4
74HC04M
1011
IC19E
IC204A
1
7406M
6
R215
7
5
6
R210
6N139
8
IC205
3
R206
2
6N139
8
6
5
7
R209
2
3
IC206
R212
D201
R205
R204
GND
R203
+5.3V
D200
P203
C203
GND
V24
R202
Z200
Z201
R211
GND
F200
P201
1
2
4
3
5
6
16
7
9
10
13
14
11
12
18
25
15
22
17
24
19
8
21
23
P201
GNDC
/CTS
/DSR
/RXD
P202
IC200
5 RXD
7 CTS
9 DSR12
/DSR
14
/CTS
16
/RXDRS
/TXD
/RTS
RESET
MC145407
–
CEXT
+
–
CEXT
+
C209
17
+10V
C202
4
–10V
10 TXD
8 RTS
6 DTR
R201 R200
P200
1
2
3
C200
C201
15RESET
13
/RTS
11
/TXD
18
20
3
1
IC207
8
27
36
5
DS8921
R213 R214
DTR 20
TXD
RTS
RXD
CTS
DCR
+5VEXT
GNDI
+20M1
–20M1
+20M2
–20M2
+TXD
–TXD
+RXD
–RXD
+RS422I
–RS422I
+RS422O
–RS422O
F201
F202
F203
F204
F205
F206
F207
F208
F210
F212
F213
F214
F215
F216
F217
F218
F219
26
27
1
+
+
GND
V24
GND
GND
+
+5V
+
+
232
CL
422
+5V
+5V
1
2
1
12
13
IC02D
&
11
74HC08M
RI+
RO RI–
DI DO+
IC19A
12
74HC04M
1
+5V
GND
R216
R217
+5V
P209P208
P205
P204
R207
R208
P206
P207
DO–
GND
+5V
C205 – C208
GND
IC512C, D
9
8
12
74HC08M
IC03B
1
GND
10
11
13
&
&
GND
IC204C, E
56
11
7406M
10
1
1