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3. No serial data is received for one second after the last + character. At this time the unit will respond
affirmatively per the selected echo/response mode.
4. The character string ATH is received, terminated with a carriage return. The unit will respond
affirmatively per the selected echo/response mode and drop the network connection. The serial interface
will revert to accepting command strings.
If the above sequence is not followed, the unit will remain in data transfer mode.
Table 12 - 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 1-character response or full verbose.
n=0 enables 1-character response.
n=1 enables full verbose.
Note: These AT commands are only recognized as single commands like ATE0 or ATV1; compound commands such as
ATE0V1 are not recognized. All other AT commands with Modem Mode set to full verbose acknowledge with an OK, but
no action is taken.
3.14.6 Send the Escape Sequence (+++) in Modem Mode
Disable or enable the ability to send the escape sequence. The default is Y (Yes) (send the escape sequence).
3.14.7 Auto Increment Source Port
Y (Yes) auto increment the source port. The NET232 increments the port number used with each new
connection
3-34 NET485 User Guide