Siemens MC55 AT manual AT&C Set Data Carrier Detect DCD Line mode, AT&Cvalue, 250 , Siemens

4.2AT&C Set Data Carrier Detect (DCD) Line mode

The AT&C command determines how the state of the DCD line (circuit 109) reflects the MC55's internal activity.

Syntax

Exec Command

AT&C[<value>]

Response(s)

OK

Reference(s)

V.250 , SIEMENS

PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last

! % ! % % % ! ! !

Parameter Description

<value>(num)(&W)(&V)

[0]	DCD line shall always be on.
1(&F)	DCD line shall be on only when data carrier signal is present.
2	DCD line shall be on when one or more Internet services defined on the related
	serial channel are in state "Connecting" or "Up" as described below. For details

on the various service states refer to AT^SISI, parameter <srvState> or AT^SISO, parameter <srvState>.

• SOCKET, HTTP, SMTP, POP3: DCD shall be on when <srvState>="Connnecting" or "Up"

• FTP: DCD shall be on when data channel is connected, i.e. <srvState>="Up"

MC55_ATC_V04.00	Page 86 of 475	3/17/06
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