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6.5
Network Interface Card (NIC)
An OpenComms Network Interface Card (NIC) enables the STS2 to communicate to a network
management system (NMS). The NIC provides the internal hardware and software to communi-
cate, via SNMP , to any I.P .-based Ethernet network through an RJ-45 connector using Category 5
cabling.
The NIC provides redundant paths for communications that make it possible to connect to a Build-
ing Management System (BMS) using Modbus, while simultaneously communicating to a NMS
through SNMP . A terminal block provides the connection to Modbus.
See Figure 21 on page 39 and Figure 22 on page 40 for the location of the NIC.
See Figure 28 on page 46 control wiring information.
If you have questions about the NIC, refer to the OpenComms Network Interface Card Installation
and Users Guide.
6.6
Remote Source Selection
The Remote Source Selection allows the preferred input source to be chosen from a remote loca-
tion. A user supplied normally open dry contact allows the user to remotely select a source to be the
preferred source in the same process as the local source transfer selection.
The unit's preferred source selection and Remote Source Selection are active at the same time, with
the STS2 following the last request for a preferred source change, regardless of whether it was from
the local or Remote Source Selection controls.
See 10.3 - Enabling Remote Source Selection on page 61 for instructions on enabling the
Remote Source Selection.
See Figure 21 on page 39 and Figure 22 on page 40 for the location of the Remote Source Selec-
tion option.
See 5.5 - Remote Source Selection Wiring on page 16 and Figure 23 on page 41 for informa-
tion on the control wiring.
6.7
Key Lockout Switch
The key lockout switch activates a software lockout of the touch screen display to prevent manual
transfers and configuration changes. When locked out, the touch screen becomes a read only dis-
play. A key is needed to do manual transfers or change settings.
The alarm silence button is not disabled when in the lockout position.
The switch is located on the front of the unit next to the display; it is behind the front door but can
be operated without opening the front door. See Figure 8 on page 26 to Figure 10 on page 28 for
the key lockout location on each unit.
See 14.1.5 - Key Lockout Switch on page 102 for instructions on using the key lockout switch.
6.8
Redundant Output Breaker
An output plug-in, non-automatic circuit breaker is provided which allows redundancy in the out-
put power path. The breaker is connected in parallel with the output plug-in non-automatic circuit
breaker.
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