Wire Replacement I/O (900 MHz): User Manual and Reference Guide
5.1.4 Sensor Power
l
To minimize power drain of the I/O solar power or battery system, the I/O Master terminal
block includes an input terminal called
Sensor Power
.
Sensor Power
has an internal 10
KΩ pull-down to Ground.
l
The
Sensor Power
parameter setting in the
IO Settings
tab in
Tool Suite
determines the
Sensor Power
behavior.
l
When in
Gated
mode, the
Sensor Power
terminal both activates sensor power at the
controlled I/O Slaves, and activates Analog Outputs at the I/O Master interface board.
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For more information, see
.
When connecting the
Sensor Power
terminal, consider:
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If the RTU provides a switched
Sensor Power
output, connect it to this terminal.
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Verify that the level at
Sensor Power
falls to less than 1.0 V when de-asserted to ensure
the I/O Slaves mirror.
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If not, connect additional pull down resistance externally.
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The state of
Sensor Power
can be mirrored at the I/O Slave, powering or disconnecting
any connected sensors.
l
To activate this control, use
Tool Suite
to change the
Sensor Power
parameter setting
on the I/O Master to
1
or
Gated
.
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For more information, see the
Sensor Power
parameter description in
5.1.5 Digital Inputs
Complete these steps to connect the Digital Inputs on the I/O Master to the end device.
1. Connect the Digital Output wires from the RTU to Digital Input 1, 2, 3, or 4 screw terminals
on the terminal block of the I/O Master.
2. Connect the Ground wire from the RTU to any of the Ground screw terminals on the I/O
Master's terminal block.
Note
: Some RTUs use isolated I/O and may require a ground connection for each input and output.
5.1.6 Analog Outputs
The Analog Outputs on the terminal block are 1-5 V at low current.
Caution
: Any 4-20 mA current sensing resistor on the RTU
must be removed
.
To determine whether RTU-internal resistors are active, test the link with a full scale input.
Complete these steps to connect the Analog Outputs on the I/O Master to the end device:
LUM0008AG Rev Sep-2015
Page 75 of 131
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