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C3 User Guide

Voltage analog input

• The C3 inputs can measure voltages up to 10 V

• Higher voltage ranges can be measured by employing a divider resistor to

match the 10 kΩ internal input impedance (Figure 18 right) and setting the

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0 – 10 V

INPUT

0 – 20 V

10 kΩ

INPUT

Figure 18. Voltage input examples

Serial devices

• The C3 supports connection to two-wire RS485 (Figure 19), standard

RS232 (Figure 20) and SDI-12 (Figure 21) serial devices

• Devices can be powered via the 12 V (600 mA) output associated with the

port or powered separately

• RS485 and SDI-12 are addressed multi-drop buses and so can have

more than one device connected to the same port provided that each

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• For best performance multiple connections to the RS485 or SDI-12 ports

should be made along a single length of cable with the C3 at one end.

This is known as a daisy-chain.

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DAVIS Electronic Rain Counter Guía de usuario Pagina 48