User guide

UMTS/HSPA
UC20 EVB User Guide
UC20_EVB_User_Guide Confidential / Released 24 / 25
4 Operating Procedure for UC20
4.1. Turn on UC20 Module
1. Connecting the UC20-TE-A module to the connector on UC20 EVB_V1.01, charging the 5V power
adapter, pulling up S201 to ON state, D103 (PWR_LED) will be bright.
2. Pressing the S202 (PWRKEY) for at least 100ms then release. The D101 (STATUS) will be light and
indicates power-on mode.
3. The D102 (NET_STATUS) will be blinking at a certain frequency. The network status of the module
can be judged by this LED. The working state of the Net Light is shown as below:
Table 8: State of NET_STATUS
DC 5V adaptor is recommended for power supply and USB cable could be used as power supply as well
(max current is 500 mA).
4.2. Turn off UC20 Module
There are several ways to turn off UC20 module.
One way to switch off the module is using the AT command AT+QPWD=1. It is best and safest approach.
This procedure lets the module log off from the network and save data before it is shut down. The other
way to switch off the module is pressing S202 (PWRKEY) at least 0.5 second and release, the module will
be shut down after then.
State
Description
0.2s On/ 1.8s Off
The module is not synchronized with network.
1.8s On/ 0.2s Off
Idle mode.
0.125s On/ 0.125s Off
Data transfer is ongoing via GSM/3G network.
always on
Calling
NOTE
Quectel
Confidential