3 NX12 RTU Set-up Requirements
3.1 Auxiliary power supply
The NX12 requires an auxiliary AC or DC supply (factory set option).
AC powered units
The NX12 requires a two (2) wire AC supply. Observe correct polarity.
It is the users’ responsibility to ensure local wiring regulations are complied with
during installation.
AC powered units may be fitted with a long life, non-rechargeable, lithium battery
to power the unit when the AC supply is off.
Suitable batteries and replacements are available from Nortech.
DC powered units
The NX12 requires a 12-24V DC supply. Observe correct polarity.
It is the users’ responsibility to ensure local wiring regulations are complied with
during installation.
DC powered units may be fitted with a long life, non-rechargeable, lithium battery
to power the unit when the DC supply is off.
Suitable batteries and replacements are available from Nortech.
3.2 Battery Operation
The NX12 monitors its auxiliary power supply. When the auxiliary supply is lost,
provided a battery is connected, the unit will continue to operate as follows:
Low power mode:
Modem switched off, will be turned on for
communications as required.
Analogue and Digital Inputs scan rate reduced to
250ms.
RS485 Modbus polling stops.
3.3 USB Port / Field Support Kit
The NX12 is normally shipped with the customer’s default parameter values already
configured.
The NX12 provides a USB interface to allow the user to configure operational
parameters from a laptop/PC. Parameters are stored in non-volatile memory (they
are retained during power outages).
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