LTE Module SeriesEC25&EC21 AT Commands ManualEC25&EC21_AT_Commands_Manual 219 / 23114.8. SMS Character Sets ConversionsIn 3GPP TS 23.038 DCS (Data Coding Scheme) defined three kinds of alphabets in SMS, GSM 7 bitdefault alphabet, 8 bit data and UCS2(16bit). AT+CSMP can set the DCS in text mode (AT+CMGF=1). Intext 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 OutputWhen DCS=GSM 7 bit, the input or output needs conversion. The detailed conversion tables are shownas 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 OutputGSM 7 bit GSM Input or output GSM character sets.GSM 7 bit IRAInput 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 UCS2Input or output a hex string similar to PDU mode. So only supportcharacters „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 toPDU 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 toPDU mode. So only support characters „0‟-„9‟ and „A‟-„F‟.0 1 2 3 4 5 6 70 00 10 20 30 40 50 60 701 01 11 21 31 41 51 61 712 02 12 22 32 42 52 62 723 03 13 23 33 43 53 63 734 04 14 24 34 44 54 64 745 05 15 25 35 45 55 65 75
