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Connecting a separate power supply
Many controllers cannot supply 1 amp at 5 volts, so it may be necessary to connect a separate power supply. To ensure correct operation, the separate power supply should be connected as per the
diagram below. The 0 V of the separate power supply should be connected to the 0 V of the controller to ensure that the line driver in the DSi and line receiver in the controller are using the same
reference voltage. The 10 ohm resistor minimises current flow due to different 0 V potentials.
TONiC readhead
TONiC readhead
DSi
Ti interface
5 V
5 VS
0 VS
0 V
Ti interface
Customer
electronics
5 V
Output signals
0 V
10 Ω
5 V
5 VS
0 VS
0 V
External
power supply
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