ADLINK ACL-7120A/6 - Manual (Page 33)

Programming
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Write operation:
The digital output states are written as 1 single byte to the port at
address BASE+N (N=0,1,2,3). Data is written to all 8 bits as a single
byte.
For example:
In BASIC:
05 BASE=&H2A0
06 VALUE1% = &H3F
07 VALUE2% = &HF3
10 OUT(BASE + 0), VALUE1% ‘ the digital outputs (DO0-DO7) will’
be (00111111)
20 OUT(BASE + 2), VALUE2% ‘ the digital outputs (DO16 - DO23)
will be (11110011)