User's Manual

Page 24 of 31

The related AT commands are listed as follows:

·Set USB Disk start-up mode: AT+BOOTDEV=0

·Set Modem start-up mode: AT+BOOTDEV=1

·Set Read-Only mode: AT+FILEMODE=1

·Set Read-Write mode: AT+FILEMODE=0

·Switch from Modem mode to USB Disk mode: AT+DEVCHG

3.4 Extended Mass Memory

The U6100 module supports T-Flash card as extended mass memory device. The Max capability is 32GB.

4. Application Illustration

4.1 Dial-up procedure

The type “S” means the AT Command sent to U6100, and the type “R” means Respond from U6100.

SN. Type AT Command/Respond Explain

S AT+CPIN? SIM card querying

R READY

S AT+CPNNUM PIN And PUK querying

R PIN1=3; PUK1=10; PIN2=0; PUK2=8

S AT+NWLCK? SIM LOCK querying

R +NWLCK: NETWORK UNLOCKED

S AT+CIMI Get IMSI

R 460020177608847 IMSI, by which APN is selected

S AT+CGDCONT=1,"IP","CMNET" Set APN

R OK

S ATDT*99***1# Dial-up

PPP protocol