Eport-E20 Super Port User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
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Table8.
Eport-E20 EVK Interface
Function
Name
Describe
External
Interface
COM
Main data/command RS-232 interface
USB_UART
UART to USB debug interface
（
Used for PC debug
envirement which without RS232 interface, Need load
drivers to use
）
, Can be power supply port
DC5
DC 5V input
EXT PORT
GPIO Pin interface
JMP
4Pin USB or RS232 jumper.
All jump to left choose USB Serial..
All jump to right choose RS232
LED
Power
3.3V Power Indicate
Link
Network indicator,
Detailed functions see
LED1_Link Pin
<Notes
>
Data
Communication indicator,
Detailed functions see
LED2_Data Pin
<Notes
>
Button
Reset
“Reset” Button
Reload
Press down the button more than 3s and then loose
to restore factory setting
2.11. Typical Application
Figure 10.
Eport-E20 Hardware Typical Application
Notes:
nRST-
Input.Hardware reset signal. Effective Low.
There is internal pull-up resistor to 3.3V and no external pull-up resistor needed. MCU put nRST signal
to low for at least 10ms if need to reset the device.
nReload
- Input.Device restore to factory default configuration. Effective Low;
（
Recommend this pin
to connect button or jumper header, Used for batch upgrade and configuration
）
Can connect with external button or chip pin, When press nReload button, pull the pin to Low level
more than 3s, then loose, device will restore to factory default setting and restart itself. If nReload
function is not required, Can leave this pin open
, Don’t need any connection.
