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It is essential that the network be wired
as a daisy chain as shown in fig 20.
Fig 21 & 22 show examples of how
NOT to wire a ModBus network.
Short communication runs, 1mm (18 gauge) twisted
pair unshielded wire can be used, however for
longer runs or where electrical noise may be
present twisted pair with shield should be used.
Factory Test Mode
The SMT‐770 is fitted with a simple factory Test
Mode where you can confirm that all relays outputs
functions and the current configuration of the
thermostat.
Ts = 0
Factory Test Function is OFF.
Ts = 1
Display DIP switch configuration code.
Ts = 2
Relay test mode. All relays cycle on then off in an endless loop.
Ts = 3
Factory Software reset – Press Fan button to confirm.
40 | P a g e
Figure 20
Figure 21
Figure 22
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