Rs485/422 - Wiznet WIZ127SR User Manual

2.4.2.

RS485/422

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