Wiring Examples; Open Collector Output Driving A Relay; Logic Level Output - NetComm NTC-220 User Manual

than open drain. The resistor can be pulled up to 3V3 for Cmos compatible output or 8.2V by software. The
Analogue Input pin can read values from 0V to 30V. It is divided by a resistor network to read appropriate levels in
the processor. Depending on the sensor type used, the pull up resistor can be switched on or off. If using the
NAMUR sensor configuration, the pull up will be activated to 8V2 by default.

Wiring Examples

The following examples are shown as a guide as to what can be achieved by the I/O features. It is up to the system
integrator to have enough knowledge about the interface to be able to achieve the required results.
Important – NetComm Wireless does not offer any further advice on the external wiring requirements or wiring to particular sensors, and
will not be responsible for any damage to the unit or any other device used in conjunction with it. Using outputs to control high voltage
equipment can be dangerous. The integrator must be a qualified electrician if dealing with mains voltages controlled by this unit.

Open Collector Output driving a relay

Any output can be configured to control a relay. This is an example where the transistor will supply the ground
terminal of the solenoid. External voltage is supplied to the other side of the solenoid.

Logic level Output

An output can be used with the pull up resistor to provide a logic level output which would be suitable to control
an external digital device.
NTC-220 – User Guide
UG01028 v1.2 March 2019
184 of 193
© NetComm Wireless 2019