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”)
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‟.
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