SCADAmetrics EtherMeter EM-100, Installation, Operation And Maintenance Manual

Page: 33 / 79

31
12 AUXILIARY I/O CHANNELS
As an added benefit, the EtherMeter is equipped with five (5) auxiliary inputs and outputs: Two (2)
analog inputs, and three (3) digital I/O. The auxiliary I/O make the device suitable for deployment
as a standalone RTU at low-complexity locations, such as master meter vaults or even simple
pumping stations.
Auxiliary I/O Type Notes
Digital
Input(s)
(0,1,2, or 3)
Dry Contact Only.
Closed = ON (1)
Open = OFF (0)
Shared DC Common with Meter IO, Analog IO, and LOOP+.
Digital
Output(s)
(0,1,2 or 3)
0-5V TTL
Requires an external NRTL-Listed or Recognized Solid-State Relay.
eg. Power-IO P/N IO-ODC-60 for DC loads, or Power-IO P/N IO-OAC-
280 for AC loads.
Digital Output #1 can be used for radio power-saver output.
Shared DC Common with Meter IO, Analog IO, and LOOP+.
Analog
Input 1
4-20mA (default) or 0-5VDC.
0-5VDC is activated by removing JP1 (inside case).
4-20mA loop resistance = 240 Ohms.
Shared DC Common with Meter IO, Digital IO, and LOOP+.
Caution: AIN1+ should NEVER be connected to a voltage greater than
5VDC above the Shared DC common.
(See Recommended Wiring Diagram later in this section.)
Unless the external analog device is powered by LOOP+, an
external analog-to-analog isolation module should be used! (eg.
Dataforth Sensorlex
®
8B series or DSCA series modules.)