Rs-485 Serial Interface Circuit Board Diagram - Casio UP-250 Technical Manual

RS-485 Serial Interface Circuit Board Diagram

R9
R8
R2
R1
TO HOST
CN1
1 FG
FG
2 SD2
SD/SD1
3 SD1
RD/SD2
4 RD2
RS/RD1
5 RD1
/RD2
6
DR/INIT1
7 SG
SG
8 DR2
/DR1
9 DR1
/DR2
10 CS2
/CS1
11 CS1
/CS2
12
13
14
15
16
17
18
19
20
ER
21
22
23
24
25
INIT2
0 FG
SHELL
R12
U2
R13
CS1 CS1 8
R10
CS2 CS2 7
DR2 6
DR1 5
R5
U1
R6
RD1 8
R3
RD2 7
SD2 6
SD1 5
R11 R4
SG
— 147
TP2
+5V
1
+
5
2 CTS
V
3 DR
4 SG
+5V
CTS
1
DR
2 RD
3 SD +5V
4 SG
SD
RD
SG
SG
—
TO MAIN BOARD
CN2
1
DK 1
2
DK S
3
PG
4
PG
5
+24V
6
+24V
7
PG
8
HOST_RTS
R17
CTS 9
CTS
SG 10
DET
11
R16 RTS
DR 12
CLKIN/DTR
SG 13
R18 CLKREQ
SG 14
SG
+5V 15
+5V
16
DK 2
17
DK G
C5 18
+
DK P
19
5
PG
20
V
+24V
21
+24V
TP1 22
PG
SG 23
SG
SD 24
SD
RD 25
RD
26
(RES)
27
#25_RESET
28
DSR_RESET
29
#RESET
SG 30
SG
R19
R14
R15
R7
/