Siemens AC75 manual Case GSM IRA to 8 bit IRA to 16 bit

AC75 AT Command Set

1.5 Supported character sets

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1.5.2.2Implementing input of Terminal data to SIM (direction TE to TA)

Used character set	DCS = 7 bit	DCS = 8 bit	DCS = 16 bit
	GSM	Data	UCS2
GSM	Case 1	Case 2	Case 3
	GSM (1:1)	IRA to 8 bit (2:1)	IRA to 16 bit (4:2)
UCS2	Case 4	Case 5	Case 6
	UCS2 to GSM (4:1)	UCS2 to 8 bit (4:1)	UCS2 to 16 bit (4:2)

Note: The ratio between the number of input characters and bytes stored on the SIM is given in parentheses.

Case 1

Every character is sent from TE to TA as GSM character (or ASCII with standard terminal emulation, e.g. Hyper- terminal).

Character value must be in range from 0 to 127 because of 7-bit GSM alphabet.

To reach maximum SMS text length of 160 characters in 140 bytes space characters will be compressed on SIM. This must be set using the parameter <dcs> of AT+CSMP (add 64).

Example: "ABCDEFGH" typed is sent and stored uncompressed as → 4142434445464748'H (stored com- pressed as 41E19058341E91'H)

Case 2

Every data byte is sent as 2 IRA characters.

Maximum text length is 280 IRA characters which will be converted into 140 bytes SMS binary user data Example: "C8" typed is sent as 43'H, 38'H → stored as C8'H

Case 3

Every 16-bit value is sent as 4 IRA characters.

Maximum text length is 280 IRA characters which will be converted into 70 UCS2 characters (16-bit each) Number of IRA characters must be a multiple of four because always 4 half bytes are needed for a 16-bit value Example: "D2C8" typed is sent as 44'H, 32'H, 43'H, 38'H → stored as D2C8'H

Case 4

Every GSM character is sent as 4 IRA characters representing one UCS2 character. Example: To store text "ABC" using UCS2 character set you have to type "004100420043".

This is sent as 30'H,30'H,34'H,31'H, 30'H,30'H,34'H,32'H, 30'H,30'H,34'H,33'H → detected as IRA representa- tion of 3 UCS2 characters, converted to GSM character set and stored as 41'H, 42'H, 43'H.

Maximum input is 640 IRA characters repesenting 160 UCS2 characters when compression is active. These are converted to 160 GSM 7-bit characters.

Without compression only 140 GSM characters can be stored which are put in as 560 IRA characters. Values of UCS2 characters must be smaller than 80'H (128 decimal) to be valid GSM characters. Number of IRA characters must be a multiple of four. Problems:

•"41" → Error, there are four IRA characters (two bytes) needed

•"0000" → Error, not an UCS2 character

•"4142" → Error, value of UCS2 character > 7F'H

•"008B" → Error, value of UCS2 character > 7F'H

This affects the maximum input length of a string)

Case 5

Every UCS2 character is sent as 4 IRA characters and is converted into two 8-bit values. This means that the first two characters have to be '00'.

Example: UCS2 character 009F'H typed as "009F" is sent as 30'H,30'H,39'H,46'H → converted into 8-bit value 9F'H.

Maximum number of UCS2 characters is 140 which are represented by 560 IRA characters. Number of IRA char- acters must be a multiple of four.

Case 6

Every UCS2 character is sent as 4 IRA characters each and is converted into a 16-bit value again. Example: UCS2 character 9F3A'H typed as "9F3A" is sent as 39'H,46'H,33'H,41'H → converted into 9F3A'H. Maximum number of UCS2 characters is 70 which are represented by 280 IRA characters. Number of IRA char- acters must be a multiple of four.

Invalid UCS2 values must be prevented.

AC75_ATC_V01.002	Page 25 of 569	10/30/06
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