Jinan USR IOT Technology WIFI232-A User Manual page 24

Figure 19
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. 1. 1. 1. Weld Weld Weld 0 0 0 0 ohm Weld ohm ohm ohm resistance resistance resistance resistance in in in in red
2. 2. 2. 2. Remove Remove Remove the Remove the the the component component component in in in in yellow component
BOT side component
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>
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>
AT+RELD<CR>
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
Jinan USR IOT Technology Limited
USR-WIFI232-A/B/C User Manual
Ethernet Reference
Ethernet Ethernet Reference Ethernet Reference Reference Design
red red red position position position position
yellow yellow position yellow position position position
Figure 20 Schematic
Schematic Schematic
Schematic resistance
to open ethernet WAN port function
Open ethernet function permanently
Command with "F" need to be affective after AT+RELD
Page 24 of 93
Design without Transformer
Design Design without without without Transformer Transformer Transformer
TOP side component
resistance resistance changes changes
resistance changes changes
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