CEP CT63 Benutzerhandbuch - Seite 12

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2.7 Control Signals – RTS, CTS, DTR, DSR, DCD, RI

Request to Send (RTS)

RTS is used to condition the DCE for data transmission. The default level is high by internal pull up. The

exact behaviour of RTS is defined by an AT command. Software or Hardware control can be selected.

Hardware flow is the default control. The application must pull RTS low to communicate with the

modem. The modem will respond by asserting CTS low, indicating it is ready for communication.

Clear To Send (CTS)

CTS indicate that the DCE is ready to transmit data. The default level is high. You can define the exact

behaviour of CTS through an AT command, and can select software or hardware flow control.

Data Terminal Ready (DTR)

DTR indicates that the DTE is ready to transmit and receive data. It also acts as hardware 'hang-up',

terminating calls when switched high. The signal is active low. You can define the exact behaviour of

DTR with an AT command. The DTR line can also be used to switch on the modem when activated for

0.2 seconds. The DTR line must be deactivated prior to switching off the modem to ensure it switches

off (powers down) correctly.

Data Set Ready (DSR)

An active DSR signal is sent from the modem to the application (DTE) to confirm that a communications

path has been established. DSR has two modes of operation, settable using the AT command AT&S.

Data Carrier Detect (DCD)

DCD indicates that the DCE is receiving a valid carrier (data signal) when low. You can define the exact

behaviour of DCD with an AT command.

Ring Indicator (RI)

RI indicates that a ringing signal is being received by the DCE when low. You can define the exact

behaviour for RI with an AT command.

The modem supports a standard USB 2.0 Full Speed slave interface interface for AT-commands. The

maximum baud rate to communicate with the CT63 Terminal is up to 12Mbit/s.

Drivers for several operating systems (e.g. Windows Vista, Windows XP or Linux) are available. Please

Figure 5: Mini USB Type A/B connector