SiteManager Installation Guide
SiteManager Installation Guide
SiteManager Installation Guide
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2.2.2. High-side switching equipment.<br />
When an output port of the <strong>SiteManager</strong> 1029/3229 is connected to equipment<br />
that has “high-side switching” conductor connections on the input, you<br />
must apply additional circuitry to pull the output towards +.<br />
Be careful about just applying a resistor to pull the output high, as the effect<br />
and resistor value must be calculated based on the power consumption and<br />
switching voltage level of the attached equipment.<br />
A safer setup will be to use a Relay.<br />
The following example uses a 5 V relay, which means you can use the Vout<br />
of the <strong>SiteManager</strong> to pull the output high.<br />
In the following example a 24 V relay is used, which means an external<br />
source must keep the level high. Note that –V and GND must be connected<br />
when using an external source:<br />
<strong>SiteManager</strong> 1029/3229/3134 - Working with IO ports Page 6 of 14<br />
Version 1, September 2011
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