Contemporary Control Systems BASremote User Manual (firmware 3.1.x) - Manual (Page 25)

TD040300-0MF
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each of the opto-
isolators is rated for 60 VDC, install a 100 kΩ pull-up resistor between
each output and the +24 V loop supply. The common of the opto-isolators connects to
the common of the BAS Remote. Since each BAS Remote input has a 100 kΩ input
impedance, the resulting voltage divider sets the off-state voltage to 12 V. Even though
the BAS Remote input range is 0
–10 VDC, this will not harm it. Set the two thresholds
to 2 V and 3 V. The threshold points on digital signals are not critical. Consult the pulse
device manual for more guidance.
5.5 Analog Input
An analog input can measure voltage in the range of 0
–5 VDC or 0–10 VDC or it can
measure current in the range of 0 –20 mA. Transmitters that produce an elevated “zero”
such as 1
–5 VDC, 2–10 VDC or 4–20 mA can be measured as well. Using the web
page, configure the input for either voltage or current and select an appropriate range.
Scaling the input is accomplished by assigning the low and high points to engineering
units. When set as a voltage input, the input impedance is 100 kΩ and for a current
input, the impedance is 250 Ω.
With voltage measurement, connect the more positive voltage to point B and the less
positive to BAS Remote common as shown in Figure 11. On three-wire devices such
as damper actuators, the output signal is referenced to the damper’s power supply
common. That common must be at the same reference as the BAS Remote common.
Notice the connections in the diagram. In this situation it is only necessary to attach the
transmitter output to point A on the BAS Remote input.
Figure 11 — Analog Input Connections