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VIVOTEK
26 - User's Manual
DI-
DO+
DI+
DO-
Switch
External Device
External DC power
Dry contact with external DC power source to supply a relay. Dry contact is the safest connecon
to protect devices.
NC
NO
Relay
Photo
Coupler
DC
DC 0V
DC 0V
External AC power
with Protected Eart
h
AC
PE
PE
1. The DO+ pin (3.3V) provides 3.3V±10% output voltages, and the max. load is 50mA.
2. The max. voltage stress on the DO- pins is 30VDC (External power).
In order to control AC devices, the above diagram can be taken in consideration. The diagram
uses a relay to control the ON/OFF condition of the AC device.
3. An external relay can be triggered by using DO+ or by an external power source, depending
on the type of relay you use.
4. In case of using an individual relay (instead of using a relay module), for protection against
voltage or current spikes, a transient voltage suppression diode must be connected in parallel
with the inductive load.
DI/DO Diagram
DI-
DO+
DI+
DO-
Switch
External Device
External DC power
Wet contact with external DC power source to supply a relay.
NC
NO
Relay
DC
External AC power
with Protected Earth
AC
PE
PE
DC 0V
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