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4.2
AT&C Set Data Carrier Detect (DCD) Line mode
The
command determines how the state of the DCD line (circuit 109) reflects the MC55's internal activity.
AT&C
Syntax
Exec Command
AT&C[<value>]
Response(s)
OK
Reference(s)
V.250 , SIEMENS
Parameter Description
(num)(&W)(&V)
<value>
[0]
(&F)
1
2
MC55_ATC_V04.00
Confidential / Released
PIN
!
DCD line shall always be on.
DCD line shall be on only when data carrier signal is present.
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
AT^SISO, parameter <srvState>.
•
SOCKET,
HTTP,
<srvState>="Connnecting" or "Up"
•
FTP: DCD shall be on when data channel is connected, i.e.
<srvState>="Up"
Page 86 of 475
ASC0 ASC1
MUX1
MUX2
%
!
%
%
SMTP,
POP3:
DCD
MUX3 Charge
Last
%
!
!
!
or
<srvState>
shall
be
on
when
3/17/06
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