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5.1
STORE & FORWARD USING CLIENTS PROTOCOL.
The Store and Forward configuration can re-transmit all traffic it receives and in some applications this
may be required. However, to conserve valuable air time and hence improve the speed of the system,
normally only messages that are required to be forwarded on to a specific outstation are re-transmitted.
This is achieved by stripping out the addresses of incoming messages, comparing the address with the
list of outstation addresses stored in the unit and only forwarding on those that match. However, this
format requires knowledge of the clients protocol and some custom software.
The other option is to route messages via the addresses embedded in the radios, using the
Network mode. In either option there is normally local communication at the store and forward site,
via the RS232 port.
5.2
NETWORK ROUTING MODE
The RF Tech ART400 radio has a programmable, easy to use, low power, network mode
using the Hayes AT command set.
The radios are capable of relay operation and routing is under the control of the high level
application. A Hayes dial up command consists of the characters “ATD” followed by a
telephone number, in this application the telephone number is used to define the final
destination radio in a link and also the relay stations employed. As an example the dial up
command “ATD02346542” causes a link to radio number 42 to be established using radios 02,
34 and 65 as relays.
5.2.1
AT COMMAND SUMMARY
Commands are not case sensitive, when entered from a keyboard the backspace key may be
used to delete errors. Every command except the escape code (d++) must begin with
the AT prefix and be terminated with a carriage return. The maximum command line length
is 40 characters. More than one command may be entered on a line and spaces may be
entered between commands, only the first command on a line should be prefixed by “AT”.
The following commands are supported, brackets indicate an optional parameter or
character, the S registers referred to are used to store parameters relevant to this mode of
operation, they may be also accessed using the PC setup programme:
AT
Attention. Required command prefix, except with the escape code (default
+++), use alone to test for the OK result code.
D (rr...)dd
Dial. The optional relay addresses (rr) and the destination address (dd)
should be entered as two digit decimal values in the range 00 to 99. Relay
addresses must be entered in the order they will be encountered with the
first relay address appearing immediately after the D character. Once entered
the radio will attempt to establish a link through the relays with the
destination.
For example;
ATD03
Dial out directly to radio number 3
ATD010203
Dial out to radio number 3, using radios 1 and 2 as relays.
O
Switch from command mode to transparent mode. Once transparent mode is
entered no more AT commands will be interpreted, transparent mode is
terminated with the escape code.
H
Hang up. The hang up command disconnects a link and should be issued to
the radio through which the link was originally established using the dial
command. If transparent mode has been entered the escape code must first
