Connecting Output Signals - Contec DIO-3232LX-USB User Manual

3. External Connection

Connecting Output Signals

Connect the output signals to a current-driven controlled device such as a relay or LED.
The connection requires an external power supply to feed currents.
This product controls turning on/off the current-driven controlled device using a digital value.
Output Circuit
Vcc
Optocoupler
Optocoupler
* O-xx represents the output pin.
Figure 3.7. Output Circuit
The output circuits of interface blocks of this product is illustrated in Figure 3.7.
The signal output section is an Optocoupler isolated, open-collector output (current sink type).
Driving the output section requires an external power supply.
The rated output current per channel is 100mA at maximum.
The output section can also be connected to a TTL level input as it uses a low-saturated transistor for
output. The residual voltage (low-level voltage) between the collector and emitter with the output on
is 0.5V or less at an output current within 50mA or at most 1.0V at an output current within 100mA.
A zener diode is connected to the output transistor for protection from surge voltages. A
PolySwitch-based overcurrent protector is provided for every 8 output transistors. When the
overcurrent protector works, the output section of this product is temporarily disabled. If this is the
case, turn of the power to the PC and the external power supply and wait for a few minutes, then turn
them on back.
CAUTION
When the PC is turned on, all output are reset to OFF.
30
Unit
Plus
common
Output pin
Zener
diode
Output pin
Zener
diode
PolySwitch
Minus
common
External device
*
External power
Load
*
supply
12 - 24VDC
Load
DIO-3232LX-USB