Copyright © Dr Robot Inc. 2005
16
RING n.n.n.n
A remote device, having IP address n.n.n.n, is connecting to
this device.
1-Character Response
0 OK
1 Connected
2 Ring
3 No
Carrier
4 Error
Received commands must begin with the two-character sequence AT and be terminated with
a carriage return character.
The unit ignores any character sequence received
not
starting with AT, and only recognizes and
processes single AT-style commands. The unit treats compound AT commands as unrecognized
commands.
If the Full Verbose option is in effect, the unit responds to an unrecognized command string that is
otherwise formatted correctly (begins with AT and ends with carriage return) with the
OK
message
and takes no further action.
If the 1-Character Response option is in effect, the unit responds to an unrecognized command string
that is otherwise formatted correctly with
OK
and takes no further action.
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 se++ 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 V.9. 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. Uses remote IP address
and port settings to initiate a connection.
ATD or ATDT
Forces the unit into Monitor Mode. Uses remote IP address
