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•
If writing fails due to timeout, then
<CmgwMode>=1 causes "+CMS ERROR: Unknown error" to be returned;
AT^SM20
<CmgwMode>=0 causes "+CMS ERROR: timer expired" to be returned.
AT^SM20
•
Note that some providers do not recognize an @ symbol used in a short message. A widely used alternative
is typing "*" as defined in GSM 03.40 (GPP TS 23.40).
•
For baudrates lower than 19200 it is recommended to use the line termination character only (refer to ATS3=
<n>, default
) before entering the text or PDU. Use of the line termination character followed by the
<CR>
response formating character (see ATS4= <n>, default
•
SMS-COMMANDs and SMS-STATUS-REPORTs cannot be stored in text mode.
•
All characters entered behind the ">" prompt will be recognized as GSM characters. For example, "Back-
space" (ASCII character 8) does not delete a character, but will be inserted into the short message as an addi-
tional physical character. As a result, the character you wanted to delete still appears in the text, plus the GSM
code equivalent of the Backspace key.
•
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
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.
•
The length of 8-bit data coded short messages has to be greater than 0.
MC55_ATC_V04.00
Confidential / Released
) may cause problems.
<LF>
Page 345 of 475
(<dcs>
of
3/17/06
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