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A typical maximum of 40 meters is permitted for sensor runs with unshielded cable. If
longer distances are required a larger diameter (0.3mm) shielded cable should be used.
When used in Start / Stop commercial programmable mode
(SW6=on SW8=off), the afterhours run timer can be toggled
on or off as required with a momentary press button on the
remote sensor. See figure 17.
As the SMT‐770 "Auto detects" sensors connected to the
"TT" terminals, temperature sensors can also be switched on
and off as required by placing a switch in the sensor wiring
Figure 16
to open circuit the sensor loop. See figure 16.
Advanced Functions
ModBus Communications
The SMT‐770 has integrated ModBus communications capabilities where, using a
remote PC or building Direct Digital Control (DDC) system may view or adjust many of
the SMT‐770 functions remotely.
It is not the scope of this manual to provide detail on the communication capability of
the SMT‐770. Detailed ModBus communications detail is available for download from
the download page at www.thermostat.com.au
38 | P a g e
Figure 17
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