Supported character set

For SMS via GSM service, the Digi device has to translate between the GSM 03.38 7-bit alphabet and ASCII. ASCII is the native character set for the Digi device and is the character set used in the CLI and web UI.

The ASCII and GSM 03.38 characters do not map one-to-one, and in fact some ASCII characters must be represented in GSM 03.38 as multi-character escape sequences (per extensions to the original GSM 03.38 alphabet). In the following table, such characters are shown as “0x1Bhh” under the “GSM 03.38 Code” column. This notation indicates a two-character sequence, where “hh” is a pair of hexadecimal digits.

In the reverse translation (from GSM 03.38 to ASCII), some of the GSM 03.38 characters have no ASCII counterpart. These are replaced with ASCII space characters. One exception is the INVERTED QUESTION MARK (0x60 in GSM 03.38) which is replaced with an ASCII QUESTION MARK (0x3F) character.

The following table documents the supported characters and the mapping used between these two alphabets. Note that “unknown” characters are replaced with space characters during the translation. In the table below, such characters appear as “0x20 *” under the “GSM 03.38 Code” column.

Notes for the table:

The GRAVE ACCENT character (0x60) in ASCII has no counterpart in GSM 03.38. The Digi device substitutes the GRAVE ACCENT with the APOSTROPHE (0x27).
The characters marked with * indicate a substitution since the ASCII characters have no counterpart in GSM 03.38. The Digi device replaces these characters with the SPACE (0x20) character. As such, the Digi ConnectPort X product does not support these characters in GSM short messages.

The following table displays the supported character set:


ASCII Code	GSM 03.38 Code	ASCII Character	Description
0x00	0x20 *	NUL	NULL
0x01	0x20 *	SOH	START OF HEADING
0x02	0x20 *	STX	START OF TEXT
0x03	0x20 *	ETX	END OF TEXT
0x04	0x20 *	EOT	END OF TRANSMISSION
0x05	0x20 *	ENQ	ENQUIRY
0x06	0x20 *	ACK	ACKNOWLEDGE
0x07	0x20 *	BEL	BELL
0x00	0x20 *	NUL	NULL
0x01	0x20 *	SOH	START OF HEADING
0x08	0x20 *	BS	BACKSPACE
0x09	0x20 *	HT	HORIZONTAL TABULATION
0x0A	0x0A	LF	LINE FEED
0x0B	0x20 *	VT	VERTICAL TABULATION
0x0C	0x1B0A	FF	FORM FEED
0x0D	0x0D	CR	CARRIAGE RETURN
0x0E	0x20 *	SO	SHIFT OUT
0x0F	0x20 *	SI	SHIFT IN
0x10	0x20 *	DLE	DATA LINK ESCAPE
0x11	0x20 *	XON	DEVICE CONTROL ONE
0x12	0x20 *	DC2	DEVICE CONTROL TWO
0x13	0x20 *	XOFF	DEVICE CONTROL THREE
0x14	0x20 *	DC4	DEVICE CONTROL FOUR
0x15	0x20 *	NAK	NEGATIVE ACKNOWLEDGE
0x16	0x20 *	SYN	SYNCHRONOUS IDLE
0x17	0x20 *	ETB	END OF TRANSMISSION BLOCK
0x18	0x20 *	CAN	CANCEL
0x19	0x20 *	EM	END OF MEDIUM
0x1A	0x20 *	SUB	SUBSTITUTE
0x1B	0x20 *	ESC	ESCAPE
0x1C	0x20 *	FS	FILE SEPARATOR
0x1D	0x20 *	GS	GROUP SEPARATOR
0x1E	0x20 *	RS	RECORD SEPARATOR
0x1F	0x20 *	US	UNIT SEPARATOR
0x20	0x20	SP	SPACE
0x21	0x21	!	EXCLAMATION MARK
0x22	0x22	"	QUOTATION MARK
0x23	0x23	#	NUMBER SIGN
0x24	0x02	$	DOLLAR SIGN
0x25	0x25	%	PERCENT SIGN
0x26	0x26	&	AMPERSAND
0x27	0x27	'	APOSTROPHE
0x28	0x28	(	LEFT PARENTHESIS
0x29	0x29	)	RIGHT PARENTHESIS
0x2A	0x2A	*	ASTERISK
0x2B	0x2B	+	PLUS SIGN
0x2C	0x2C	,	COMMA
0x2D	0x2D	-	HYPHEN-MINUS
0x2E	0x2E	.	FULL STOP (PERIOD)
0x2F	0x2F	/	SOLIDUS (SLASH)
0x30	0x30	0	DIGIT ZERO
0x31	0x31	1	DIGIT ONE
0x32	0x32	2	DIGIT TWO
0x33	0x33	3	DIGIT THREE
0x34	0x34	4	DIGIT FOUR
0x35	0x35	5	DIGIT FIVE
0x36	0x36	6	DIGIT SIX
0x37	0x37	7	DIGIT SEVEN
0x38	0x38	8	DIGIT EIGHT
0x39	0x39	9	DIGIT NINE
0x3A	0x3A	:	COLON
0x3B	0x3B	;	SEMICOLON
0x3C	0x3C	<	LESS-THAN SIGN
0x3D	0x3D	=	EQUALS SIGN
0x3E	0x3E	>	GREATER-THAN SIGN
0x3F	0x3F	?	QUESTION MARK
0x40	0x00	@	COMMERCIAL AT
0x41	0x41	A	LATIN CAPITAL LETTER A
0x42	0x42	B	LATIN CAPITAL LETTER B
0x43	0x43	C	LATIN CAPITAL LETTER C
0x44	0x44	D	LATIN CAPITAL LETTER D
0x45	0x45	E	LATIN CAPITAL LETTER E
0x46	0x46	F	LATIN CAPITAL LETTER F
0x47	0x47	G	LATIN CAPITAL LETTER G
0x48	0x48	H	LATIN CAPITAL LETTER H
0x49	0x49	I	LATIN CAPITAL LETTER I
0x4A	0x4A	J	LATIN CAPITAL LETTER J
0x4B	0x4B	K	LATIN CAPITAL LETTER K
0x4C	0x4C	L	LATIN CAPITAL LETTER L
0x4D	0x4D	M	LATIN CAPITAL LETTER M
0x4E	0x4E	N	LATIN CAPITAL LETTER N
0x4F	0x4F	O	LATIN CAPITAL LETTER O
0x50	0x50	P	LATIN CAPITAL LETTER P
0x51	0x51	Q	LATIN CAPITAL LETTER Q
0x52	0x52	R	LATIN CAPITAL LETTER R
0x53	0x53	S	LATIN CAPITAL LETTER S
0x54	0x54	T	LATIN CAPITAL LETTER T
0x55	0x55	U	LATIN CAPITAL LETTER U
0x56	0x56	V	LATIN CAPITAL LETTER V
0x57	0x57	W	LATIN CAPITAL LETTER W
0x58	0x58	X	LATIN CAPITAL LETTER X
0x59	0x59	Y	LATIN CAPITAL LETTER Y
0x5A	0x5A	Z	LATIN CAPITAL LETTER Z
0x5B	0x1B3C	[	LEFT SQUARE BRACKET
0x5C	0x1B2F	\	REVERSE SOLIDUS (BACKSLASH)
0x5D	0x1B3E	]	RIGHT SQUARE BRACKET
0x5E	0x1B14	^	CIRCUMFLEX ACCENT
0x5F	0x11	_	LOW LINE (UNDERSCORE)
0x60	0x27 (1)	`	GRAVE ACCENT
0x61	0x61	a	LATIN SMALL LETTER A
0x62	0x62	b	LATIN SMALL LETTER B
0x63	0x63	c	LATIN SMALL LETTER C
0x64	0x64	d	LATIN SMALL LETTER D
0x65	0x65	e	LATIN SMALL LETTER E
0x66	0x66	f	LATIN SMALL LETTER F
0x67	0x67	g	LATIN SMALL LETTER G
0x68	0x68	h	LATIN SMALL LETTER H
0x69	0x69	i	LATIN SMALL LETTER I
0x6A	0x6A	j	LATIN SMALL LETTER J
0x6B	0x6B	k	LATIN SMALL LETTER K
0x6C	0x6C	l	LATIN SMALL LETTER L
0x6D	0x6D	m	LATIN SMALL LETTER M
0x6E	0x6E	n	LATIN SMALL LETTER N
0x6F	0x6F	o	LATIN SMALL LETTER O
0x70	0x70	p	LATIN SMALL LETTER P
0x71	0x71	q	LATIN SMALL LETTER Q
0x72	0x72	r	LATIN SMALL LETTER R
0x73	0x73	s	LATIN SMALL LETTER S
0x74	0x74	t	LATIN SMALL LETTER T
0x75	0x75	u	LATIN SMALL LETTER U
0x76	0x76	v	LATIN SMALL LETTER V
0x77	0x77	w	LATIN SMALL LETTER W
0x78	0x78	x	LATIN SMALL LETTER X
0x79	0x79	y	LATIN SMALL LETTER Y
0x7A	0x20	z	LATIN SMALL LETTER Z
0x7B	0x1B28	{	LEFT CURLY BRACKET
0x7C	0x1B40	\|	VERTICAL LINE (PIPE)
0x7D	0x1B29	}	RIGHT CURLY BRACKET
0x7E	0x1B3D	~	TILDE
0x7F	0x20 *	DEL	DELETE