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AC75 AT Command Set

2.15 AT^SM20

AC75_ATC_V01.002 Page 79 of 569 10/30/06

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2.15 AT^SM20 Set M20 compatibility mode

M20 is an earlier, widely used SIEMENS GSM engine. The AT^SM20 command selects different modes of

responses returned upon execution of the commands ATD and sms commands like e.g. AT+CMGW. Please note

that the AT^SM20 command has no effect on any other features and is not intended to adjust other differences

between M20 and AC75.

Syntax

Parameter Description

Call setup response mode

Applies only to voice calls.

0 Set compatibility to Siemens mobile phones.

ME will return "OK" immediately after attempting a call with the ATD command.

In case of failure, additional call release indications, such as "NO DIAL TONE,

"NO CARRIER", "BUSY" will follow.

(&F)

Default call setup mode, compatible to M20.

ME will return "OK" in case of a successful connection, otherwise one of the

call release indications "NO DIAL TONE, "NO CARRIER", "BUSY" are indi-

cated.

Response mode for sending and writing short messages

Applies to the sms commands like e.g. AT+CMGS and AT+CMGW command.

0 Set compatibility to Siemens mobile phones.

ME will return +CMS ERROR: <err> when writing or sending of short mes-

sages fails.

(&F)

Default mode for sending and writing short messages, compatible to M20.

ME will return "OK", no matter whether or not sms command was successfully

executed.

Test Command

AT^SM20=?

Response(s)

Read Command

AT^SM20?

Response(s)

^SM20:<CallMode>, <CmgwMode>

Write Command

AT^SM20=<CallMode>[, <CmgwMode>]

Response(s)

Reference(s) PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

SIEMENS - + + + + + + - - -

(num)

(num)

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 568 569

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