User's Manual

Telit TRIZIUM Product Description
80264ST10007a Rev. 4– 09/09/04
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5.3.2.7 &D - data terminal ready (DTR) control
&D – data terminal ready (DTR) control
Execute command
Read command
Write command
AT&D <n>
Controls the TRIZIUM behaviour to the RS232 DTR transitions.
Parameter:
<n> = 0 DTR transitions are ignored.
<n> = 1 when the TRIZIUM is connected, the high to low transition of DTR pin sets the
device in command mode, the current connection is NOT closed.
<n> = 2 when the TRIZIUM is connected , the high to low transition of DTR pin sets the
device in command mode and the current connection is closed.
Note: if AT&D2 command is issued, the device does not answer to incoming calls if DTR is
low, even if ATA command is given.
Test command
Example
Reference V25ter
SW release Version A
5.3.2.8 &K - flow control
&K – flow control
Execute command
Read command
Write command
AT&K <n>
Controls the RS232 flow control behaviour.
Parameter.
<n> = 0 - disabled
<n> = 1 - only CTS active, Hardware mono-directional
<n> = 2 - XON/XOFF software mono direction
<n> = 3 - RTS/CTS active, Hardware bi-directional (default)
<n> = 4 - XON/XOFF, Software bi-directional with filtering
<n> = 5 - XON/XOFF, Software bi-directional without filtering (Pass Through)
<n> = 6 - RTS/CTS active, Hardware bi-directional & software XON/XOFF (bi-
directional) with filtering
Test command
Example
Reference
SW release Version A
5.3.2.9 &S - data set ready (DSR) control
&S – data set ready (DSR) control
Execute command
Read command
Write command
AT&S <n>
Controls the RS232 DSR pin behaviour:
n = 0 - always ON
n = 1 - follows the GSM traffic channel indication.
n = 2 - ON when connected
n = 3 - ON when device is ready to receive commands
Note: if option 1 is selected then DSR is tied up when the device receives from the network
the GSM traffic channel indication.
Test command