Specifications

MC55 AT Command Set

13.7 AT+CMGS

MC55_ATC_V03.03 Page 328 of 459 9/9/05

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• 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.