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8: Setup Mode: Channel Configuration
xDirect User Guide 49
Table 8-9 Modem Mode Messages
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 Numeric Response option is in effect, the unit responds to an unrecognized command
string that is otherwise formatted correctly with a "0" message 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 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.
Data Echo & Modem Response Full Verbose: The unit echoes modem commands and responds to
a command with a message string shown in the table below.
Numeric Response: The unit echoes modem commands and
responds to a command with a numeric response.
Modem Responses Only Full Verbose: The unit does not echo modem commands and
responds to a command with a message string shown in the table
below.
Numeric Response: The unit does not echo modem commands
and responds to a command with a numeric response.
Message Meaning
Full Verbose
OK Command was executed without error.
CONNECT A network connection has been established.
NO CARRIER A network connection has been closed.
RING n.n.n.n. A remote device, having IP address n.n.n.n, is connecting to this device.
Numeric Response
0OK
1 Connected
2Ring
3 No Carrier
4 Error