Olivetti ECR 8220, Service Manual, Page: 60 / 122

3-15. INTERFACE CIRCUIT
RJ45 I/F
COM A : IF SEL, TXD1, RTS#1, B_CTS1# and B_RXD1# are UART communication parts from the CPU.
U17(MAX3232CPWR) is RS232C transceiver.
COM A is used for PC or Barcode or EFT.
COM B : TXD2, RTS2#, RXD2 and CTS2# are UART communication parts from the CPU.
U7(MAX3232CPWR) is RS232C transceiver.
COM B is used for PC or Barcode or EFT.
COM C : TXD3, RTS3#, RXD3 and CTS3# are UART communication parts from the CPU.
U16(MAX3232CPWR) is RS232C transceiver.
COM C is fixed to connect FISCAL BOX.
SD card I/F
SD card I/F is controlled by the CPU (U1).
When the data is written/read, VSD_EN goes High and VMEM is supplied to SD card.
T1IN
11
T2IN
10
R1OUT
12
R2OUT
9
C1+
1
C1-
3
C2+
4
C2-
5
T1OUT
14
T2OUT
7
R1IN
13
R2IN
8
VCC
16
V+
2
V-
6
GND
15
U7
MAX3232CPWR
C14
0.1uF
VCC3
R127 100
C
6
6
*
10
0p
F
C
6
7
*
10
0p
F
C
6
8
*
10
0p
F
C
6
9
*
10
0p
F
R128 100
R129
100
R130 100
1
2
3
4
5
6
CN10
B6B-PH-K-S
C15
0.1uF
G
D
S
Q4
2SJ377
R138
1K
VCC5
R137
200
BCR_ON
TXD2
RTS2#
RXD2
CTS2#
BCR(RS232C) COM B
B
E
C
Q5
DTC143EKA
C1
0
0
.1
uF
C1
1
0.
1u
F
C1
2
0.
1u
F
C1
3
0.
1u
F
R9
1
10
K
R9
0
10
K
TXD2
RTS2#
RXD2
CTS2#
R206
10K
VCC3
T1IN
11
T2IN
10
R1OUT
12
R2OUT
9
C1+
1
C1-
3
C2+
4
C2-
5
T1OUT
14
T2OUT
7
R1IN
13
R2IN
8
VCC
16
V+
2
V-
6
GND
15
U16
MAX3232CPWR
C144
0.1uF
VCC3
R151 100
C
14
5
*1
00
pF
C
14
6
*1
00
pF
C
14
7
*1
00
pF
C
14
8
*1
00
pF
R152 100
R159
100
R207
100
TXD3
RTS3#
RXD3
CTS3#
C
14
9
0.1u
F
C
1
50
0.
1u
F
C
1
51
0.
1u
F
C
1
52
0.
1u
F
R2
09
10
K
R2
08
10
K
TXD3
RTS3#
RXD3
CTS3#
1
2
3
4
5
CN14
B5B-PH-K-S
COM C
T1IN
11
T2IN
10
R1OUT
12
R2OUT
9
C1+
1
C1-
3
C2+
4
C2-
5
T1OUT
14
T2OUT
7
R1IN
13
R2IN
8
VCC
16
V+
2
V-
6
GND
15
U17
MAX3232CPWR
C153
0.1uF
VCC3
R211
100
C
1
54
*1
00
pF
C
1
55
*1
00
pF
C
1
56
*1
00
pF
C
1
57
*1
00
pF
R212 100
R213 100
R214 100
RS_TXD1
RS_RTS1#
RS_RXD1
RS_CTS1#
C
158
0.1
uF
C
159
0.
1u
F
C
160
0.
1u
F
C
161
0.
1u
F
1
2
3
4
5
CN15
B5B-PH-K-S
COM A
G
19
A1
11
Y1
9
A2
13
Y2
7
A3
15
Y3
5
A4
17
Y4
3
U6B
TC74VHCT244FT
TXD1
RTS1#
IF_SEL
TXD1
RTS1#
IF_SEL
B_CTS1#
B_RXD1#
B_CTS1#
B_RXD1#
F6
POLY FUSE/JUMPER L=5mm
R1
88
10
K
R1
87
10
K
R2
15
10
K
C1
0.1uF
R42 33
R43 33
R44 33
R1
3
10
0
k
R1
4
10
0
k
VMEM
G
D S
Q1
HAT1089C-EL-E
R1
100k
R28
51
VSD_EN
R8
2
1
0K
R8
3
1
0K
VCC3
VCC3 VMEM
C30
*10pF
R41 33
R1
2
10
0
k
VMEM
R46 33
R45 33
SD_CS#
SD_DO
SD_CK
SD_DI
SD_CARD
SD_WP
1
2
3
4
5
6
7
8
9
10
CN2
A2004WV10-10
+
EC1
10uF_16V
(A)
SD card
Service Manual 60