WIZ127SR User’s Manual
7
2.4.2.
RS485/422
Figure 4 Reference schematic for interfacing to RS485/422
SP3485
RO
1
RO
2
DE
3
DI
4
GND
5
A
6
B
7
VCC
8
UART2_TX
UART2_RX
UART2_RTS
VDD3V3
0.1uF
120R
485+
485-
HEADER 2
1
2
RS485 Example Circuit
VDD3V3
0.1uF
485_TX-
UART2_RX
UART2_TX
SP3701E
VCC
1
RO
2
DI
3
GND
4
Y
5
Z
6
B
7
A
8
120R
485_RX-
HEADER 4
1
2
3
4
RS422 Example Circuit