User guide

Modem Emulation AT Command Set
Chapter 3 Modem Emulation Commands 267
Modem Emulation AT Command Set
The following commands can be issued to perform actions in a modem-
emulation configuration scenario.
AT
Command
Function
Result
Code
n+++n
When in data mode, this command causes the modem to switch to
command mode. The value of n corresponds to the required delay before
and after the escape sequence is entered. The delay can be changed by
modifying S-register 12. The escape character can be changed by
modifying S-register 2.
A/ Repeats the last command string.
AT? Prints the value of the last-accessed S-register.
ATA
Answer command: Answers an incoming TCP connection and switches to
data mode.
ATD
(ipaddress):
(ipport)
Used to connect to a remote network device. This command directs the Digi
device to go on-line, dial according to the IP address entered as follows,
and attempt to establish a TCP connection.
Dial Modifiers. The valid dial string parameters are described below.
Punctuation characters may be used for clarity with parentheses, hyphen,
and spaces being ignored.
• 0-9: DTMF digits 0 through 9.
• . (period): Dot notation used for IP addresses. IP addresses are written
as four numbers separated by periods, where the first number is
between 1 and 255, and the other three numbers are between 0 and
255. Enter the IP address in the format xxx.xxx.xxx.xxx
• : (colon): Colon notation used for the TCP port.
• L: Redial the last number. The modem will reconnect to the last IP
address accessed. The L must immediately follow the D, and any
following characters are ignored.
• P: This command is accepted but not acted on.
• T: This command is accepted but not acted on.
• R: This command is accepted but not acted on.
• , (comma): This command is accepted but not acted on.
ATEn
Command echo. The Digi device enables or disables the echo of characters
to the DTE according to the parameter supplied. The parameter value, if
valid, is written to S14 bit 1.
• E0: Disables command echo.
• E1: Enables command echo.
OK n=0 or 1
ERROR
Otherwise
ATH
Disconnect (Hang up) command.
H0, H1: Hangs up the TCP connection if a connection is active.
OK n=0 or 1
ERROR
Otherwise
ATIn
Identification command.
• I0, I1: Reports product name.
• I3: Reports product name and firmware revision.
• I4: Reports product configuration.
• I6: Reports network connection information.
OK n=0 or 9
ERROR
Otherwise