Chapter 1 – Introduction

Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 14

1.6.2 UCS2 and GSM Data Coding and Conversion for SMS Text Mode

This section provides basic information on how to handle input and output character conversion for SMS text mode

and Remote-SAT if the internal (TA) and external (TE) character representation differ; e.g., if the Data Coding

Scheme and the TE character use different coding.

1.6.2.1 Implementing Output of SIM Data to Terminal (Direction TA to TE)

Used Character

Set

DCS = 7 bit

GSM

DCS = 8 bit

Data

DCS = 16 bit

UCS2

GSM Case 1

GSM (1:1)

Case 2

8 bit to IRA (1:2)

Case 3

UCS2 to IRA (2:4)

UCS2 Case 4

GSM to IRA (1:4)

Case 5

8 bit to IRA (1:4)

Case 6

UCS2 to IRA (2:4)

Note: The ratio of SIM bytes to output bytes is given in parentheses.

Case 1

Every GSM character is sent to TE as it is (8-bit value with highest bit set to zero).

Example: 47’H, 53’H, 4D’H  47’H, 53’H, 4D’H, displayed as “GSM”.

Case 2

Every data byte will is sent to TE as 2 IRA characters each representing a half byte.

Example: B8’H (184 decimal)  42’H, 38’H, displayed as “B8”.

Case 3

Every 16-bit UCS2 value is sent to TE as 4 IRA characters.

Example: C4xA7’H (50343 decimal)  43’H, 34’H, 41’H, 37’H, displayed as “C4A7”.

Problem: An odd number of bytes leads to an error because there are always two bytes needed for each USC2

character.

Case 4

Every GSM character is sent to TE as 4 IRA characters to show UCS2 in text mode.

Example: 41’H (“A”)  30’H, 30’H, 34’H, 31’H, displayed as “0041”.

Case 5

Every data byte is sent to TE as IRA representation of UCS2 (similar to case 4).

Example: B2’H  30’H, 30’H, 42’H, 32’H, displayed as “00B2”.

Case 6

Every 16-bit value is sent to TE as IRA representation of it. It is assumed that number of bytes is even.

Example: C3x46’H  43’H, 33’H, 34’H, 36’H, displayed as “C346”.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 307 308

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