Quectel EC25 User Manual

LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 187 / 231
When <reqstr> is given, a mobile initiated USSD string or a response USSD string to a network initiated
operation is sent to the network. The response USSD string from the network is returned in a subsequent
+CUSD URC.
Parameter
AT+CUSD Unstructured Supplementary Service Data
Test Command
AT+CUSD=?
Response
+CUSD: (list of supported <mode>s)
OK
Read Command
AT+CUSD?
Response
+CUSD: <mode>
OK
Write Command
AT+CUSD[=<mode>[,<reqstr>[,<dcs>
]]]
Response
OK
ERROR
If there is any error related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
120s, determined by network.
Reference
3GPP TS 27.007
<mode> Integer type. Sets/shows the result code presentation status to the TE
0 Disable the result code presentation to the TE
1 Enable the result code presentation to the TE
2 Cancel session (not applicable to Read Command response)
<reqstr> Unstructured Supplementary Service Data (USSD) to be sent to the network. If this
parameter is not given, network is not interrogated.
<rspstr> Unstructured Supplementary Service Data (USSD) received from the network
<dcs> Integer type. 3GPP TS 23.038 Cell Broadcast Data Coding Scheme (default 15)
<status> USSD response from the network or the network initiated operation
0 No further user action required (network initiated USSD Notify, or no further
information needed after mobile initiated operation)
1 Further user action required (network initiated USSD Request, or further
information needed after mobile initiated operation)
2 USSD terminated by network
3 Another local client has responded
4 Operation not supported
5 Network time out

Quectel EC25 Specifications

General

Category	LTE Module
LTE TDD	B38/B40/B41
WCDMA	B1/B5/B8
GSM	850/900/1800/1900 MHz
Data rates	LTE Cat 4: 150 Mbps DL/50 Mbps UL
GNSS	GPS/GLONASS/BeiDou/Galileo/QZSS
Operating Temperature	-40°C to +85°C
Form Factor	LCC
Storage Temperature	-45°C to +90°C
SIM Interface	1.8V/3.0V
Antenna Interface	Main, Diversity, GNSS
LTE FDD	B1/B3/B5/B7/B8/B20
Interfaces	USB 2.0, UART, PCM, GPIO
Operating Voltage	3.3V - 4.3V
Protocols	TCP/IP, UDP, FTP, HTTP, HTTPS
Certifications	CE, FCC, PTCRB, GCF, RCM, IC