PCIe-AIO14 User Manual (Rev 1.2)
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http://www.daqsystem.com
3.4 Digital I/O Circuit
Digital input and output circuits that support 24-bit inputs and outputs, respectively,
support shielded external interfaces by applying photocouplers.
3.4.1 Digital Input Circuit
When the ground is connected to the DIN_COM pin and the 'HI' input signal is input to the DIN
signal, the internal signal becomes 'LO' to sense the signal input.
DIN0
BIN0
BINx
+3.3V
+3.3V
2.4K
DINx
2.4K
DIN_COM
[Fig 3-6. Digital Input Circuit]
3.4.2 Digital Output Circuit
Apply the BOUT signal to 'LO'. Since current can be passed between the collector and the
emitter, a circuit can be constructed between the DOUT and DOUT_COM pins and controlled.
BOUT0
DOUT0
BOUTx
DOUTx
+3.3V
DOUT_COM
22
22
330
+3.3V
330
[Fig 3-7. Digital Output Circuit]