Rs-232 Serial Interface Circuit Board Diagram - Epson TM U200D - B/W Dot-matrix Printer Technical Manual

RS-232 Serial Interface Circuit Board Diagram

TO HOST
1
FG
2
SD/SD1
3
RD/SD2
4
RS/RD1
5
/RD2
6
DR/INIT1
7
SG
8
/DR1
9
/DR2
10
/CS1
11
/CS2
12
13
14
15
16
17
18
19
20
ER
21
22
23
24
25
INIT2
0
SHELL
CN1
Rev. B
+5V
C1
+12V
U1
16 2
VCC V+
C2 C3
4 1
C2+ C1+
5 3
C2- C1-
RD 13 12 RD
R1I R1O
DSR 8 9 DSR
R2I R2O
SD 14 11 SD
T1O T1I
DTR 7 10 DTR
T2O T2I
15 6
GND V-
C7
SG SG
RTS RTS
D1
DSR
R2
C6
R20
S
G
D2
-12V
D3
C4
R15
#25INIT
R12
R11
SG
D4
DSR
DTR
+5V
+ +
1 5
2 V
V
SD
RD
#25_RESET
DSR_RESET
SG SG
RTS
R7
+12V
R16
D #
R3
S 2
+12V
R 5
| |
R R
E E
RTS
S S
R4
8
E E
3
T T
1
2
R17
U2A
4 +
5
V
R18
-12V
R5
R8
-12V
R13
+12V
R9
R14
5
7
R6
6
U2B
R10
-12V
R19
TM-U200D/U200PD Technical Manual
TO MAIN BOARD
CN2
1
DK 1
2
DK S
3
PG
4
PG
5
+24V
TP2
6
+24V
7
PG
RTS 8
HOST RTS
DSR 9
CTS
SG 10
R21 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
5
+24V
21
V
+24V
22
PG
23
SG
SG
SD 24
SD
RD 25
RD
26
(RES)
27
#25_RESET
28
DSR_RESET
29
#RESET
SG 30
SG
R1
C5
R
Q1
T
10K
S
10K
Q2
TP1
10K
10K
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