Rev 1.5
SignalFire Telemetry
4
Connections and Components
Power
Power must be provided by the Power Input screw terminals (6-36VDC). The module
power requirements at 12VDC is 25mA average plus 15mA per energized relay channel.
Antenna
The antenna port is standard RP-SMA connector. Connect this port to a suitable 900MHz antenna.
SignalFire can supply a variety of antennas for use with the modules.
Analog Input
The analog input operates as a passive voltage input (1-5V).
Wire the analog voltage to the set of screw terminals. Maximum input voltage is 10 Volts. If the input
is a 4-20mA signal, use a high-precision 250Ω resistor from the analog input terminal to ground to
convert the signal to 1-5V.
1-5V Signal
GND
4-20mA Signal
GND
A. Input 1
A. Input 1
Digital Inputs
The digital inputs (2 total) can be dry contact or voltage (must be push-pull and pull to ground, 30
Volts max). Be sure to connect the ground bus from the module to either the ground of the voltage
device or the dry contact.
The digital inputs report their current state, as well as input frequency. The DI pulse counter
increments only when the state changes from 0 to 1. The Instantaneous Frequency registers are the
number of pulses per second within 2 seconds of check-in multiplied by 10. The Average Frequency
registers are the number of pulses per second over the period between two check-ins multiplied by
10. The Counts/Min registers are the total number of pulses per minute between two check-ins
multiplied by 10.
