Installation (cont.)
FGRIO Master
(1) Rx, Tx, B+
•
Receive, Transmit, and Power are available on screw terminals of the FGRIO
Master terminal block as well as the 10 pin header.
(2) Analog Output
•
The Analog Output wire is connected from the Analog Output 1,2,3 or 4 screw ter-
minal on the FGRIO Master terminal block to the Analog Input of the RTU
(destination device).
•
Common Ground is required. It is recommended to run a Ground wire from an
FGRIO Master Ground screw terminal to Ground on the RTU.
NOTE: Analog Output is 1-5 V at low current, so any 4-20 mA current sensing resistor
on the RTU MUST BE REMOVED. If in doubt as to whether RTU-internal resistors
are active, test the link with a full scale input.
(3) Digital Output
•
The Digital Output wire is connected from the Digital Output 1,2,3 or 4 screw termi-
nal on the FGRIO Master terminal block to the Digital Input of the RTU (destination
device).
•
Common Ground is required. It is recommended to run a Ground wire from the
FGRIO Master Ground screw terminal to Ground on the RTU.
NOTE: The Digital Output actively drives Low (.4V) and High (4.0V). Remove any
RTU input pull-up resistor, if less than 10 K ohms. Verify that signal levels meet the
RTU input requirements after connection to the RTU.
(4) Digital Input
•
The RTU Digital Output Wire is connected to Digital Input 1,2,3 or 4 screw terminal
on the terminal block of the FGRIO Master. An internal 10Kohm pullup to +5V is
provided.
•
The RTU Ground Wire is connected to any of the Ground screw terminals on the
terminal block of the FGRIO Master. Some RTUs use isolated I/O and may require
a ground connection for each input and output.
(5) Sensor Power
•
To minimize power drain of the IO Slave Solar/Battery System, an input terminal
called Sensor Power is provided on the FGRIO Master terminal block. Sensor
Power has an internal 10 Kohm pull-down to Ground.
•
If the RTU provides a switched sensor power output, connect it to this terminal.
Verify that the level at Sensor Power falls to < 1.0 V when de-asserted to ensure the
slaves will mirror. If not, connect additional pull-down resistance externally.
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