Long Distance 9600 SCADA Link
Location: South Pacific Islands
Features:
Full Duplex Realtime 9600 bps
Keyed Carrier
Background: The
customer, an electrical utility, needed to upgrade an old
and ailing low capacity data link between its SCADA host
station and a remote PLC operating as a data concentrator.
The hot carrier VHF analog radio links had been
unreliable for some time and with new stations being added
to the system at the remote end, a more reliable higher
capacity radio system was required. Operating between
two islands, line access via the PSTN was ruled out as too
costly and not reliable enough for the system requirements.
Two hops of radio were required with the inter-island hop
being around 200 km end to end. The fade margin
provided by the old radios was inadequate with the links
regularly "dropping out " altogether. To complicate
matters, the radio site at the host end was about two
kilometers from the Host PLC and the repeater station was
prone to lightning strikes. Interference from
adjacent radio sites had also caused problems. The PLC
supplier who had been commissioned to add the new
outstations approached Radata Systems because of our
specialist knowledge of radio data communications.
With a large range of high performance equipment to
choose from the task was challenging but
achievable.
Download application note
here