Communications Document
8
Networking Hardware
The RSC-1 adapter provides the ability to network serial devices over an EIA-485 bus using the
MODBUS
TM
protocol. A null modem cable is used to connect a PC to the RSC-1, while a straight-
through serial cable is used to connect a Morningstar device to the RSC-1.
The RSC-1 requires an external power source. Input voltage to the adapter should be between
8-16V, therefore, it may be powered by a 12 Volt battery. Use a DC-DC converter for 24V, 36V,
and 48V system batteries.
!
CAUTION: Tapping off individual batteries in a bank can
cause an imbalanced battery bank. Always use a DC-DC
converter if the nominal system voltage is greater than 12V.
2.1.3 Meter Hub (HUB-1)
Figure 3. Morningstar Meter Hub (model:HUB-1)
The Meter Hub allows for easy scalability of a MeterBus
TM
networkbyprovidingveextraRJ-11
MeterBus
TM
ports. Ports 1-4 are electrically isolated from Power Output and Power Input Ports A
& B. Each draws operating power from the device connected to the Port. Up to four Meter Hubs
can be linked on the same MeterBus
TM
network. Refer to Section 3.2 for more information regard-
ing proper use of Meter Hubs.
2.2 Other Equipment
In addition to Morningstar equipment, other 3rd party networking supplies will usually be needed.
The following is a description of products which may be needed for proper networking. These
products will be mentioned throughout this manual; please take the time to familiarize yourself
with them.
Forsome,aspeciccompany/productrecommendationismade.Recommendations made are