GTCOM2 User manual
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Figure 35 System Options> General System Options
1.
Connect 1-Wire sensors DS18b20 to D1 according connection diagram.
Figure 36DS18b20 connection with long distance UTP or FTP cable
2.
If you need to connect more sensors to the same input, connect them as a star or serial. Each line should be separated by 82-120 Ohm
resistor
Figure 37 Star connection
The resistor must be as close as possible to the contacts of the module GTM1.