Uart Interface - Jinan USR IOT Technology USR-WIFI232-A2 User Manual

USR-WIFI232-A2 User Manual http://www.usriot.com
This module Ethernet interface default is for the application with transformer connection. If you
need PHY-PHY directly connection, please change the hardware as follows:
1. Weld 0 ohm resistance in red position
2. Remove the component in yellow position
BOT side component TOP side component
Figure 13 Schematic resistance changes
Specific PHY-PHY direct connection reference to user manual chapter 1.3.2.2 application of
Ethernet without transformer and AT+FEPTP command
The command:
AT+FVEW=enable<CR> to open ethernet WAN port function
Remark:
1. Only when ethernet as WAN, this command is needed. Module default LAN port.
2. After this command, make sure module WAN IP and LAN IP in different segment. (Modify the
ALN IP in AP Settings, modify the WAN IP in STA Settings)
AT+FEPTP=on<CR>
Quey/set default ethernet PHY-PHY on/off
AT+FEPHY=on<CR>
Open ethernet function permanently
AT+RELD<CR>
Command with "F" need to be affective after AT+RELD
After module reset, command effect, then will not impact by Reload
For user's design, pls note:
1. Cable connection should be AC coupling, your cable need be pulled up to VCC (fit with PHY
chip level)
2. Cable TX connected to RX. In PHY-PHY direct connection, PHY chip dose not support
direct/ cross self-adaption
3.Your PHY chip on board should better to be forced into 100M work mode

3.5.3 UART Interface

UART interface is the serial data transmition interface mainly used for USR-WIFI232-A2 modules.
Jinan USR IOT Technology Limited Page 18 of 76 tec@usr.cn