Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 772)

APPENDIXES
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
3.6 Coding of Alpha Fields in the SIM for UCS2
The coding can take one of the three following structures, or GSM default alphabet. If
the ME supports UCS2 coding of alpha fields in the SIM, it will support all three
coding schemes for character sets containing 128 characters or less. For character
sets containing more than 128 characters, the ME will at least support the first
coding scheme. Within a record, only one coding scheme, either GSM default
alphabet, or one of the three described below, can be used.
1. If the first byte in the alpha string is ‘0x80’, then the other bytes are 16 bit UCS2
characters. The most significant byte (MSB) of the UCS2 character is coded in the
lower numbered byte of the alpha field, and the less significant byte (LSB) of the
UCS2 character is coded in the higher numbered alpha field byte. In other words,
byte 2 of the alpha field contains the most significant byte (MSB) of the first UCS2
character, and byte 3 of the alpha field contains the less significant byte (LSB) of
the first UCS2 character (as shown below). Unused bytes shall be set to ‘FF’: if the
alpha field has an even length in bytes, the last (unusable) byte will be set to ‘FF’.
Example 1
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 Byte 9
‘80’ Ch1
MSB
Ch1
LSB
Ch2
MSB
Ch2
LSB
Ch3
MSB
Ch3
LSB
‘FF’ ‘FF’
2. If the first byte of the alpha string is ‘0x81’, then the 2 nd byte contains a value
indicating the number of characters in the string. The 3 rd byte contains an 8 bit
number which defines bits 15 to 8 of a 16 bit base pointer, where bit 16, and bits
7 to 1 would be set to zero. These sixteen bits represent a base pointer to a "half-
page" in the UCS2 code space, to be used with some or all of the remaining bytes
in the string. The 4 th and subsequent bytes in the string contain coding as follows:
• if bit 8 of the byte is set to zero, the remaining bits of the byte contain a
GSM Default Alphabet character
• if bit 8 of the byte is set to one, the remaining bits are an offset value to
add to the 16 bit base pointer defined by byte 3, and the resulting 16 bit
value is a UCS2 code point, and defines a UCS2 character.
Example 2
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 Byte 9
‘81’ ‘05’ ‘13’ ‘53’ ‘95’ ‘A6’ ‘28’ ‘FF’ ‘FF’
In the example above
• Byte 2 indicates there are 5 characters in the string
• Byte 3 indicates bits 15 to 8 of the base pointer, and indicates a bit pattern
of 0hhh shah h000 0000 as the 16 bit base pointer number. Bengali