Schematics

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
SEQUENTMICROSYSTEMS.COM
CONNECTORS 1.1
4 RELAYS-PLUS
A
2 5Wednesday, February 17, 2021
Title
Size Document Number Rev
Date: Sheet of
SCL
SDA
3.3V
485_RX
RASP_TX 485_TX
RASP_RX
3.3V
RASP_TX
RS485B
RS485A
RDPB
RASP_RX0
+5V
1
2
J121
KY15K
C3
.22uF
J12
KY15RB
1
2
D14
SM712
12
3
R27
15K
J1
PI-CONN
1
3
5
7
9
25
39
2
4
14
20
30
34
11 12
13
6
8
10
15
17
16
18
19
21 22
23 24
26
27 28
29
31 32
33
35 36
37 38
40
R22 100
R25 10
R24 4.7K
U4
SP3485
8
3
5
2
4
6
7
1
VCC
DE
GND
RE
DI
A
B
RO
SW1
R28
4.7K
R23 100
R26 10
Q1
HX3400
+5V
SDA
SCL
GND
GND
RASP_RX0
RASP_RX