MC55_ATC_V04.00 Page 343 of 475 3/17/06
Confidential / Released
• Message Length in Text Mode
The maximum length of a short message depends on the used coding scheme: It is 160 characters if the 7
bit GSM coding scheme is used, and 140 characters according to the 8 bit GSM coding scheme.
In case UCS2 character set selected it is highly recommended to set Data Coding Scheme (<dcs> of
AT+CSMP) to 16-bit data, otherwise the length of sms user data is restricted to 88 octets. Even better for mes-
sages with UCS2 character set is the PDU Mode.
• At baudrates lower than 19200 it is recommended to use the line termination character only (refer to <n> of
ATS3, default
<CR>) before entering text or PDU. Use of the line termination character followed by the
response formatting character (see <n> of ATS4, default
<LF>) can cause problems.
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