Quectel EC25 User Manual

LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 202 / 231
These parameters will not be saved.
Example
AT+QLDTMF=? //Query the range.
+QLDTMF: (1-1000),(0-9,*,#,A-D)
OK
AT+QLDTMF=2,“A,B,1,2,#” //Play A,B,1,2,#, on time & mute time is 200ms.
OK
AT+QLDTMF //Stop playing.
OK
12.15. AT+QLTONE Play a Local Customized Tone
The command is used to play a local customized tone, use <period_on> to indicate play time and
<period_off> to indicate mute time, and <duration> to indicate total time.
Parameter
AT+QLTONE Play a Local Customized Tone
Test Command
AT+QLTONE=?
Response
+QLTONE: (0,1),(100-4000),(0-1000),(0-1000),(0-15300000)
OK
Write Command
AT+QLTONE=<mode>[,<frequency>,
<period_on>,<period_off>,<duration>
]
Response
OK
+CME ERROR: <err>
After the tone is completely played:
+QLTONE: 0
Maximum Response Time
300ms
<mode> 0 Stop playing
1 Start to play
<frequency> Tone‟s frequency. The range is 100-4000, the unit is Hz.
NOTE

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