User`s guide

Operation Theorem
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31
Digital Output (DO)
Digital GND (DGND)
Digital Input(DI)
From TTL Signal
To TTL Devices
ACL-8111
Outside Device
74LS244
74LS373
Figure 4.3 Digital I/O Connection
To program digital I/O operation is fairly straightforward. 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. Note that the DIO data channel can only be read or written
in form of 8 bits together. It is impossible to access individual bit
channel.