User's Manual

Host Device
RS232 TX
RS232 RX
IO circult
WI-Fi Module
TX circult
IO circult
RX circult
TX
nCTS
UART_RXD
nUART_RTS
RX
nRTS
UART_TXD
nUART_CTS
IO2
IO1
IO3
STATUS
nRESET
WAKEUP
Optional
Optional
Optional
Optional
Optional
3.3V
Optional
nWIFI LED/BOOT
GND
1K
MAX3232
C1+
C1-
C2+
C2-
Vcc
V+
V-
1
3
4
5
3.3V
16
2
6
14 T1OUT
T1IN
11
R1IN
R1OUT
13
12
T2OUT
T2IN
R2IN
R2OUT
7
10
8
9
IO3 FC(IO1)
Optional
3.3V
VDD
Figure 2.4 Typical hardware connection: RS232 UART Interface
MAX3485
3.3V
VCC
DI
RO
A
B
DE
RE
Host Device
RS485
IO circult
WI-Fi Module
RX circult
IO circult
TX circult
IO2
IO1
IO3
STATUS
nRESET
WAKEUP
Optional
Optional
Optional
3.3V
Optional
nWIFI LED/BOOT
GND
1K
HDC(IO1)
3.3V
VDD
Figure 2.5 Typical hardware connection: RS485 UART Interface
! ! EMW3280 Wi-Fi module
12