Siemens MC55 AT manual ATSM20 Set M20 compatibility mode, SM20CallMode, CmgwMode

2.14AT^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 MC55.

Syntax

Test Command

AT^SM20=?

Response(s)

OK

Read Command

AT^SM20?

Response(s)

^SM20:<CallMode>, <CmgwMode>

OK

Write Command

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

Response(s)

OK

Reference(s)

SIEMENS

PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last

! % % % % % ! ! !

Parameter Description

<CallMode>(num)

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.
1(&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.

<CmgwMode>(num)

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.
1(&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.

MC55_ATC_V04.00	Page 59 of 475	3/17/06
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