2.3
Peripheral Connections
2.3.1 Petro-Net™ Connections
Wired RS-485 Petro-Net™ connections can be used for communications
among the VSmart Module, the I/O Module, and the SiteSentinel®
iSite™ console. For this type of connection, a single line of twisted-pair
wiring is required. Polarity must always be observed for Petro-Net™
connections.
Twisted-pair wiring is available from OPW as Part No. 12-1029. This
type of wiring can easily be made by twisting together two 18 AWG
gas- and oil-resistant wires (THHN, TFFN or THWN). Use a minimum
of 10 twists per foot.
When connecting via Petro-Net™, the twisted-pair wiring is connected to
positions 1 and 2 of the RS-485-terminal block at each module. Petro-
Net™ connections can be daisy-chained, meaning that modules may be
connected to each other in various combinations as long as one module
in the chain is connected to the console.
Petro-Net™ connections must be made with twisted-pair wiring. The use
of conduit is recommended for protecting Petro-Net™ wires, but is not
required. If conduit is not used, bushings must be installed in the cabinet
knockouts to protect wiring and seal the enclosures. Polarity must be
observed for all Petro-Net™ wiring!
2.3.2 Wireless Connections
Wireless connections can also be used for communications between the
VSmart Module and the SiteSentinel® iSite™ console. For this type of
connection, a wireless modem is connected to the VSmart Module, and
a second modem is wired to the console’s RS-485 port. For best results,
the modems should be within a clear line-of-sight.
Wireless connections are not viable options at all installation sites due
to the presence of interference or line-of-site obstacles. Test kits are
available, but
A SITE SURVEY IS STRONGLY RECOMMENDED
BEFORE COMMITTING TO WIRELESS INSTALLATIONS.
2.3.3 Ethernet Connections
Ethernet connections are the final option for establishing
communications between the console and peripheral devices. For this
type of connection, an Ethernet cable is run between devices at a
maximum length of 300 feet (100 m), noting this distance can be
extended through the use of hubs and routers.
If more than 6 feet (1.85 m) of cable is required, the use of conduit to
protect the cable is recommended.
An Ethernet connection can also be established between the console
and a VSmart Module using an existing network. To make this
connection, simply connect the console to one node on the network and
the VSmart Module to another node.
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