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

> The AT&C command determines how the state of the DCD line (circuit 109) reflects the TC65's internal activity.
> Syntax

> Exec Command AT&C[<value>]
> Response(s)
> OK

> Reference(s) |  | PIN |  | ASC0 | ASC1 | USB | MUX1 | MUX2 | MUX3 |  |  | Charge | Q | Last
> V.250 , SIEMENS |  | - |  | + | - | + | + | + | + |  |  | - | + | -

> 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"