Cep Terminals GPRS-TERMINAL GT864 QUAD 6001 Data Sheet
Product codes
6001
CEP AG
Revision 1.3
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Page 13 of 28
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.
3 Operation
3.1 Switching ON the modem
There are two ways to switch on the modem, once power is applied.
• assert TO_IN to high level for > 1s
• activate the RS232 control line DTR
The modem is fully operational after 4 seconds. Logging onto a network may take
longer than this and is outside the control of the modem. The modem can be
configured to start up at the time power is applied by permanently tying power
connector signals TO_IN (pin 4) and VCC (pin 1) together. In this case DTR must be
used to switch the modem on again after it has been switched off or reset, while
power is still applied.
Note: DTR must be cycled from low to high.
Note: The TO_IN signal requires a positive “edge” (a sharp” signal transition from low
to high) to turn the modem on. This transition should be a rising signal from 0V
(GND) to VCC, or at least a large fraction of that voltage range, and must be applied
at the same time as VCC or after it. Very slow transitions (significantly slower than
(GND) to VCC, or at least a large fraction of that voltage range, and must be applied
at the same time as VCC or after it. Very slow transitions (significantly slower than