Commercial In Confidence
27
JP1 Link
1-2
for 2 antenna operation
Link
2-3
for single antenna operation
3.3
REPEATER/STORE & FORWARD OPERATION
To achieve greater distances the ART product can be used in a “repeater” or “store &
forward” mode. However, the success of this mode of operation may depend on the system’s
protocol, further details are in section 5.
3.3.1 REPEATER
A full repeater will require two ART’s coupled together via a cable, one is used to
communicate with one side of the link and the other to the distant outstation or outstations.
A signal received by either receiver will trigger the transmitter in the opposite unit and data
will be passed on. If the protocol is known, it is possible to store addresses in the products
memory and only pass on messages when there is match. However, this will require special
software.
3.3.2 STORE
&
FORWARD
3.3.2.1 Single
Unit
Operation
For single frequency operation incoming messages are stored and then re-transmitted.
Depending on the application & software, all or some of the messages may be forwarded.
If the outgoing message channel is different from the incoming message channel, it is
possible to receive the signal and store it, change frequency and re-transmit it. The unit will
then wait for a reply on the new channel and store it, change to the other channel and return
the reply.
It is obvious that there can be various timing problems with this set-up and as the radio
modem has a default state, all calls should be initiated from one direction.
If different inbound to outbound channels are to be used, we strongly recommend that two
ART’s are used back to back as outlined below.