Quectel EC25 User Manual

LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 201 / 231
2. DTMF characters - ASCII:
DTMF
ASCII
DTMF
ASCII
0
48
8
56
1
49
9
57
2
50
A
65
3
51
B
66
4
52
C
67
5
53
D
68
6
54
*
42
7
55
#
35
12.14. AT+QLDTMF Play Local DTMF
The command is used to play a local DTMF string, and the maximum length is 20 characters. It can be
used to stop playing the DTMF string.
Parameter
AT+QLDTMF Play Local DTMF
Test Command
AT+QLDTMF=?
Response
+QLDTMF: (1-1000),(0-9,*,#,A-D )
OK
Write Command
AT+QLDTMF=<n>,<DTMF_string>[,<y
>]
Response
OK
+CME ERROR: <err>
After the DTMF string is completely played:
+QLDTMF: 5
Execute Command
AT+QLDTMF
Response
OK
Maximum Response Time
300ms
<n> Numeric type. Indicates every DTMF‟s play time and mute time. The range is 1
-1000, and the unit is 1/100 second when <y> is set to 1, or 1/10 second when <y>
is not set.
<DTMF_string> String type. Maximum 20 DTMF strings, separated by comma. DTMF format: 0-9,
*, #, A-D.

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