Reporting of Analog Values to a WS3500 for scaling and alarming
via SNMP or TL-1 - see WS3500 Product Info.
Reporting of threshold crossings via TBOS to any concentration
device that supports the TBOS protocol.
8 Analog inputs per WS-ARM/1, can be daisy chained together on
RS-485 serial channel.
The WS-ARM/1 is a free-standing remote alarm monitoring unit that
collects raw analog values, and reports to a concentration device
for scaling and alarm presentation. It was designed to collect critical
power data to provide a practical solution to monitoring and managing
DC power systems, but can also be used for other applications in
a telecommunications facility.
Designed to meet Network Equipment Building Standards (NEBS) Level
3 testing requirements, the WS-ARM/1 augments the WS3500 Remote
Terminal Unit (RTU) by adding an economically priced product to
collect analog data.
Each WS-ARM/1 can collect data from up to eight analog inputs and
up to four temperature and humidity sensors. Two (2) inputs are
fixed 0 to -60VDC that will typically be used to monitor battery
voltage, while the remaining six (6) inputs are able to interface
to any Industry Standard Architecture (ISA) transducer that supports
4 - 20mA or bipolar 100mV. In addition to the power system parameters,
this also allows users to measure analog values for other input
types such as temperature, humidity, pressure, and dangerous gas
The ARM/1 can be wall or shelf mounted, close to the equipment being
monitoring. This simplifies installation by reducing the amount
of wiring that would otherwise be required, and also minimizes the
voltage drop and induced noise from long wiring runs. The unit is
powered with -48VDC @ 1.7W with no load on the inputs.
The WS-ARM/1 uses a subset of the Distributed Network Protocol (DNP3)
over either an RS-232 or RS-485 serial connection. When using RS-485,
the unit can be multi-dropped with up to 4 remotes on a WS3500 serial
port. Discrete reporting of threshold crossings via TBOS is also