2. GT47/GT48 CONTROL TERMINALS
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LZ T 123 7 605 P1C
2.4.7 Serial Communication
The Control Terminal enables an end-to-end communication path to be
established between the telemetry/telematics application, either hosted
internal or connected externally, and a remote terminal or host, via the
GSM network. Once a path has been set up, voice or data communication
can take place. An RS232 9-signal serial interface is available via the
Control Terminal’s 15-way high density data connector.
This primary serial interface can be used to:
1.C o nt
ro l t
he G T47 via an ext
ernal PC o r m ic ro -c o nt
ro ller using AT
c o m m ands;
2.Send and rec eive dat
a.
The Control Terminal supports the full set of AT commands according to
GSM 07.05 and GSM 07.07. It also supports an extended set of Ericsson
proprietary AT commands to add extra functionality.
AT commands are used to operate the Control Terminal with a broad range
of functions including:
• configuring general parameters of the Control Terminal
• setting up and controlling communications to and from the GSM
network
• obtaining GSM network status information
Additionally the Control Terminal provides a second RS232 serial
interface, operating as a 4-signal and GND interface, with hardware flow
control (Rx, Tx, CTS and RTS). This 4-signal serial interface is controllable
via embedded applications and may be used to control external accessories
e.g. a GPS receiver.
For more detail on the AT commands supported by the Control Terminal
see GR47/GR48 AT Commands Manual.
2.4.8 Extended I/O Interface
The Control Terminal contains several general purpose, configurable,
input and output signals. Signals may be reconfigured by AT command or
by intrinsic function when using embedded applications.
• 1 analogue input
• 3 digital inputs
• 5 digital outputs
• + 4.8V DC output
In addition, 6 of the control signals on the primary RS232 interface can be
reconfigured for use as digital inputs or outputs if required.