VIVOTEK
User's Manual - 21
DI/DO Diagram
DO+
DO-
DI1+
DI2+
DI3+
DI- (common GND)
RS485-
RS485+
AC/DC pw
AC/DC pw
General I/O Terminal Block
This Network Camera provides a general I/O terminal block which is used to connect external
input / output devices. The pin definitions are described below. The “AC/DC pw” pins can be
used to connect both 24V AC and 12V DC power source.
1. The DO+ pin provides a 5V output, and the max. load is 50mA.
2. The max. voltage for DO- pins is 80VDC (External power).
In order to control AC devices, the following diagram can be taken into consideration. This
diagram uses a relay to control the ON/OFF condition of the AC device.
3. An external relay can be triggered by using the 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+
DI+
DO-
External
power source
VDC
Switch
BJT transistor
Relay
AC
Source
NO NC
External
device
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