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as shown in the figure or from another power source, so long as the
ground is common with the Relay Driver ground.
CAUTION: If using a power source other than Relay Driver
power, the source voltage must be less than or equal to
the Relay Driver power voltage.
5.2 Communications Wiring
The Relay Driver communicates through both the RS-232 serial port
and Meter Bus ports. The serial port allows communication with the
Relay Driver using a PC while the Meter Bus allows communication
between the Relay Driver and other Morningstar Devices. Morningstar
Devices include the TriStar controller, local and remote TriStar Meters,
and of course the Relay Driver.
5.2.1 Meter Bus Network
A Meter Bus network consists of two (2) or more Morningstar devices
daisy-chained together with RJ-11 cables. The Meter Bus network uses
a proprietary communication protocol to transmit and receive
information between each Morningstar Device on the network.
The Meter Bus ports on the Relay Driver are opto-isolated and do not
provide power to the Meter Bus. Isolation allows each Relay Driver on
the Meter Bus network to have its own power source and ground if
needed.
However, every Meter Bus network must have power. The TriStar
Controller provides the needed power to the Meter Bus so that
communication is possible. For this reason, every Meter Bus network
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