User guide

7: Setup Mode: Channel Configuration
SDS1101/2101 User Guide 53
When an active connection is in effect, the unit transfers data and does not process
commands received from the serial interface.
When a connection is terminated or lost, the unit reverts to command mode.
When an active connection is in effect, the unit terminates the connection if it
receives the following sequence from the attached serial device:
 No serial data is received for one second.
 The character sequence +++ is received, with no more than one second
between each two characters.
 No serial data is received for one second after the last + character. At this time,
the unit responds affirmatively per the selected echo/response mode.
 The character string ATH is received, terminated with a carriage return. The
unit responds affirmatively according to the selected echo/response mode and
drops the network connection. The serial interface reverts to accepting
command strings.
If this sequence is not followed, the unit remains in data transfer mode.
Table 7-8. Modem Mode Commands
Modem Mode
Command
Function
ATDTx.x.x.x,pppp or
ATDTx.x.x.x/pppp
Makes a connection to an IP address (x.x.x.x) and a remote port
number (pppp).
ATDTx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATD0.0.0.0
Forces the unit into Monitor Mode if a remote IP address and port
number are defined within the unit.
ATD
Forces the unit into Monitor Mode if a remote IP address and port
number are not defined within the unit.
ATDx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATH Hangs up the connection (Entered as +++ATH ).
ATS0=n
Enables or disables connections from the network going to the serial
port.
n=0 disables the ability to make a connection from the network to the
serial port.
n=1-9 enables the ability to make a connection from the network to
the serial port.
n>1-9 is invalid.
ATEn
Enables or disables character echo and responses.
n=0 disables character echo and responses.
n=1 enables character echo and responses.
ATVn
Enables numeric response or full verbose.
n=0 enables numeric response.
n=1 enables full verbose.