CEP HT63 E Podręcznik użytkownika - Strona 12

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2.5 Serial Data

The modem supports the standard data character format of

 Programmable baud rate (300bps to 230,400bps).

 Auto-configuration mode with auto-baud (1,200bps to 230,400bps).

 Multiplex ability according to GSM 07.10 Multiplexer Protocol.

Serial Data From Modem (RD)

RD is an output signal that the modem uses to send data to the application.

Serial Data To Modem (TD)

TD is an input signal, used by the application to send data to the modem.

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.