INSYS WLAN 2.1, Руководство пользователя

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Overview AT Commands INSYS WLAN serial 2.1
Command Description
ATD<IP ad-
dress>:<port>
or
ATD“<domain
name>“:<port>
Dial remote terminal
Remote terminal is an IP address
The remote terminal is specified in the format IP number:port. If no port is
specified, the own port number (set with
AT#PORT
) is also used for the remote
terminal.
Optionally, it is possible to specify information regarding the necessary proto-
col (
ATDT
for TCP/IP or
ATDU
for UDP/IP), before the remote terminal is speci-
fied. The remote terminal must be set to the according protocol.
Example:
ATDT192.168.100.111:1234
dials port “1234” of the IP address
192.168.100.111 . Protocol: TCP/IP.
ATDT192.168.100.111:1234
dials port “1234” of the IP address
192.168.100.111 . Protocol: UDP/IP.
As connection request, a UDP packet with a zero byte is sent.
For UDP connections a CONNECT is issued in each case, because there is no
connection management for UDP and therefore no confirmation from the
recipient to the sender. The data is merely distributed into the network with-
out confirmation.
The remote terminal is a domain name:
If the remote terminal is a domain name, the INSYS WLAN serial 2.1 must first
query the IP address of the domain from a domain name server to be able to
establish a connection. A DNS server must be defined using the command
AT#DNS
.
Example:
ATD“www.google.com
“:80
dials the domain www.Google.com at port 80.
AT&D<n>
Behavior with DTR drop
When the DTR line is deactivated during an existing connection, the function
set through
AT&D
is executed.
AT&D0
Ignore DTR drop (for operation at modules which do not
serve the DTR line)
AT&D2
A DTR drop causes the module to terminate the connection
(default)
AT&D3
A DTR drop caused the module to terminate the connection
and perform a reset
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