Sms Character Sets Conversions - Quectel EC25 Command Manual

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
DCS AT+CSCS
GSM 7 bit GSM
GSM 7 bit IRA
GSM 7 bit UCS2
UCS2 -
8 bit -
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")
0 1
0 00 10
1 01 11
2 02 12
3 03 13
4 04 14
5 05 15
EC25&EC21_AT_Commands_Manual
The Way of SMS Text Input or Output
Input or output GSM character sets.
Input or output IRA character sets.
Input: UE will convert IRA characters to GSM characters.
Output: UE will convert GSM characters to IRA characters.
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.
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‟.
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‟.
2 3
20 30
21 31
22 32
23 33
24 34
25 35
EC25&EC21 AT Commands Manual
4 5
40 50
41 51
42 52
43 53
44 54
45 55
LTE Module Series
6 7
60 70
61 71
62 72
63 73
64 74
65 75
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