Quectel EC25

LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 219 / 231
14.8. SMS Character Sets Conversions
In 3GPP TS 23.038 DCS (Data Coding Scheme) defined three kinds of alphabets in SMS, GSM 7 bit
default alphabet, 8 bit data and UCS2(16bit). AT+CSMP can set the DCS in text mode (AT+CMGF=1). In
text mode, DCS (Data Coding Scheme) and AT+CSCS determine the way of SMS text input or output.
Table 14: The Way of SMS Text Input or Output
When DCS=GSM 7 bit, the input or output needs conversion. The detailed conversion tables are shown
as below.
Table 15: The Input Conversions Table (DCS=GSM 7 bit and AT+CSCS=“GSM”)
DCS
AT+CSCS
The Way of SMS Text Input or Output
GSM 7 bit
GSM
Input or output GSM character sets.
GSM 7 bit
IRA
Input or output IRA character sets.
Input: UE will convert IRA characters to GSM characters.
Output: UE will convert GSM characters to IRA characters.
GSM 7 bit
UCS2
Input or output a hex string similar to PDU mode. So only support
characters „0‟-„9‟ and „A‟-„F‟.
Input: UE will convert the UCS2 hex string to GSM characters.
Output: UE will convert the GSM characters to UCS2 hex string.
UCS2
-
Ignore the value of AT+CSCS, input or output a hex string similar to
PDU mode. So only support characters „0‟-„9‟ and „A‟-„F‟.
8 bit
-
Ignore the value of AT+CSCS, input or output a hex string similar to
PDU mode. So only support characters „0‟-„9‟ and „A‟-„F‟.
0
1
2
3
4
5
6
7
0
00
10
20
30
40
50
60
70
1
01
11
21
31
41
51
61
71
2
02
12
22
32
42
52
62
72
3
03
13
23
33
43
53
63
73
4
04
14
24
34
44
54
64
74
5
05
15
25
35
45
55
65
75