Rabbit EM1500, Руководство по эксплуатации продукта

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EM1500 User’s Manual
www.rabbit.com
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such as the ones that are specific to modem control signals that are not actually avail-
able.
Rather than telephone numbers, the EM1500 uses IP addresses or host names to iden-
tify the “called party.” The ATDT command is used to set up a network connection to
another EM1500 or host, in much the same way as the ATDT command tells a stan-
dard modem to dial out on the POTS (Plain Old Telephone Service).
The advantage of supporting an industry standard command set is that legacy serial
devices that know how to talk to a modem can now talk to the EM1500 without know-
ing the difference. The serial device becomes “network enabled” without significant
work.
Table 5.1 Supported Command Set
Command Action
A
Enter “auto answer” mode. The EM1500 waits for a network
connection to be made to the serial port. When a connection is
made, a CONNECT message is sent to the serial port then
normal data transfer is started.
D Reconnect to the host that was last connected ('redial').
DL Reconnect to the host that was last connected ('redial').
D domainname
Connect to specified domain name, e.g., “em1500.foo.com”
using the TCP port that was last used.
D domainname tcp_port
Connect to specified domain name, e.g., “em1500.foo.com”
using the specified TCP port number in the range 1..65535.
DT ipaddr
Connect to specified IP address using TCP port number that
was last used. The IP address is in decimal format, with 4
groups of decimal numbers in the range 0..255 inclusive. The
delimiter between each number may be any punctuation
character (usually a period).
DT ipaddr tcp_port
As above, but specify a particular TCP port number in the range
1..65535.
DP local
Connect to host specified by local configuration entry “local”
which is a number in the range 1 to 65536. “local” must match a
number that is specified in one of the “Opening” tab items in
the “Local TCP port” field. This may be the “Opening” entry
for any serial port, not just the one through which the AT
command is being issued. The configuration entry needs to be
set up with valid “Remote TCP port” and “Remote host”
definitions for this command to be useful.
E0 Disable echoing of AT commands
E1 Enable echoing of AT commands