Cep Terminals GSM/GPRS TERMINAL CT63 JAVA 6203 用户手册
产品代码
6203
CEP AG
Revision 1.4
_________________________________________________________________________________
__________________________________________________________________________________________
Page 9 of 32
2.6 Serial Data Signals
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.
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.
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.
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.
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.
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.
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.
define the exact behaviour for RI with an AT command.