USR-WIFI232-D2 Hardware Manual
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Jinan USR IOT Technology Limited
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PIN
Name
Signal Type
Definition
1
TX1+
O
1.8V interface. Supporting direct connection with
external transformer or Ethernet AC Coupling without
external transformer. From 1~4 respectively are are
Ethernet 1 , output-, input+, input-.
2
TX1-
O
3
RX1+
I
4
RX1-
I
5
NET1_LED
O
LED for Ethernet 1. Low level means connection normal,
blinking means data transmission.
6
UART_TXD
O
If user don’t need UART function, these four pins can be
set to GPIO function mode. Then user can send AT
command to query/set GPIO status.
GPIO6
I/O
7
UART_RXD
I
GPIO7
I/O
8
UART_RTS
O
GPIO8
I/O
9
UART_CTS
I
GPIO9
I/O
10
RESET
I
Reset the module, take effect in low level. Press over
300ms and release to reset the module.
11
1.8V
O
1.8V@300mA, used for Ethernet.
12
GND
P
Power ground.
13/14
3.3V
P
3.3V@350mA, VCC.
15
GND
P
Power ground.
16
nLink
O
WIFI connected, output “0”; otherwise output “1”. Can be
set as GPIO.
GPIO16
I/O
17
nReady
O
Module starting normally, output “0”; otherwise output
“1”. Can be set as GPIO.
GPIO17
I/O
18
nReload
I
Take effect in low level. Press over 3 seconds and
release to restore default settings.
GPIO10
I/O
19
NET2_LED
O
LED for Ethernet 2. Low level means connection normal,
blinking means data transmission.
20
RX2-
I
1.8V interface. Supporting direct connection with
external transformer or Ethernet AC Coupling without
external transformer. From 20~23 respectively are are
Ethernet 2 input-, input+, output-, .
21
RX2+
I
22
TX2-
O
23
TX2+
O
Figure 2 Pin definition