Rs-232 Serial Interface Circuit Board Diagram - Epson TM-U200 series Technical Manual

C o n fid e n tia l

RS-232 Serial Interface Circuit Board Diagram

U1
C2
RD
DSR
SD
DTR
TO HOST
1
FG
2
SD/SD1
3
RD/SD2
4
RS/RD1
5
/RD2
6
DR/INIT1
7 SG
SG
8
/DR1
9
/DR2
10
/CS1
11 RTS
/CS2
12
13
14
15
16
17
18
19
20
ER
21
22
23
24
25 DSR
INIT2
0
SHELL
CN1
#25INIT
Rev. A
+5V
C1
+12V
16 2
VCC V+
C3
4 1
C2+ C1+
5 3
C2- C1-
13 12 RD
R1I R1O
8 9 DSR
R2I R2O
14 11 SD
T1O T1I
7 10 DTR
T2O T2I
15 6
GND V-
C7
SG
RTS
D1
R2
C6
R20
S
G
D2
-12V
D3
C4
R15
R12
R11
SG
D4
+ +
1 5
2 V
V
SG
RTS
+12V
R16
D #
R3
S 2
+12V
R 5
| |
R R
E E
S S
R4 8
E E
3
T T
1
2
R17
U2A
4 +
5
V
R18
-12V
R5
-12V
R13
+12V
R9
R14
5
7
R6
6
U2B
R10
-12V
R19
TM-U200 Series (Type B) Technical Manual
TP2
DSR
R21
DTR
+5V
+
5
V
SD
RD
#25_RESET
DSR_RESET
SG
R1
C5
R
Q1
T
10K
S
R7
10K
Q2
10K
10K
RTS
R8
/
TO MAIN BOARD
CN2
1
DK 1
2
DK S
3
PG
4
PG
5
+24V
6
+24V
7
PG
RTS 8
HOST RTS
DSR 9
CTS
SG 10
I/F DET
11
RTS
DTR 12
CLKOUT/DTR
13
CLKREQ
14
SG
+5V 15
+5V
16
DK 2
17
DK G
18
DK P
19
PG
20
+24V
21
+24V
22
PG
SG 23
SG
SD 24
SD
RD 25
RD
26
(RES)
27
#25_RESET
28
DSR_RESET
29
#RESET
SG 30
SG
TP1
Appendix A-12