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Operation Theorem
4.4 Digital Input and Output
The PCI-9112 provides 16 digital input and 16 digital output channels
through the connector CN1 and CN2 on board. The digital I/O signal are
fully TTL/DTL compatible. The detailed digital I/O signal are specified in
section 1.3.
To program digital I/O operation is fairly straight forward. The digital input
operation is just to read data from the corresponding registers, and the
digital output operation is to write data to the corresponding registers. The
digital I/O registers‘ format are shown in section 4.5. Note that the DIO
data channel can only be read or written in form of 16 bits together. It is
impossible to access individual bit channel.
Digital Output (DO)
Digital GND (DGND)
Digital Input(DI)
From TTL Signal
To TTL Devices
ACL-8112
Outside Device
Figure 4.4 Digital I/O Connection