Contec DIO-1616TB-PE, Руководство пользователя, Страница: 47 / 63

3. External Connection
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DIO-1616TB-PE
Connecting Output Signals
The signal output section is TTL driver output and each output signal is sent to an external device as
negative logic.
Output Circuit
Opto-coupler
ISO/5V
GND
Vcc
JP2
Minus Common
ISO/GND
JP3
Vcc
GND
Output Pin
External circuit
Board
Vcc
Plus Common
* Output pin represents O-xx.
Figure 3.5. Output Circuit
The output circuits of interface blocks of this product are illustrated in Figure 3.5. The signal outputs
are TTL level signals isolated by opto-couplers. This product therefore requires the on-board internal
power supply or the external 5VDC power supply to drive the output section of this product.
CAUTION
- The Opto-coupler used on this board, with power turned, feeds low-level output when the primary
circuit is not driven.
- Using the external power supply:
The Opto-coupler keeps on outputting low-level while the external power supply is turned on and
the PC is off.
- Using the internal power supply:
Since the internal power supply ISO/5V is enabled earlier than the PC’s Vcc, the opto-coupler
outputs the low level for several ms while the PC is off or before the PC is turned on.
- Please refer to “Selecting Power Supply” and then connect the jumper in accordance with the power
supply to be used.