Octagon PC-510, User Manual

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11-6
EZ I/O PC-510 user’s manual
Writing and reading from EZ I/O
Writing to or reading from the desired EZ I/O port is accomplished with
single program statements:
1. To write a bit pattern to the desired EZ I/O port:
OUT 332h, FFh
All bits of port C go high; all input bits are unaffected.
2. To read a bit pattern from the desired EZ I/O port:
PORTC = INP(332h)
The byte read from port C is assigned to variable port C.
EZ I/O output program examples
To configure ports A, B, and C as all outputs, issue the commands:
OUT 333h, 2 ‘Direction’ Mode
OUT 330h, FFh ‘PortA’
OUT 331h, FFh ‘PortB’
OUT 332h, FFh ‘PortC’
OUT 333h, 3 ‘Operation’ Mode
Note
With CAMBASIC, Octagon’s multitasking industrial language, you can
also accomplish the same configuration and outputs with one statement.
Enter:
CONFIG EZ I/O &330, &0, &FF, &0, &FF, &0, &FF
Ports A, B, and C will now output all "1"s after issuing the following
commands:
OUT 330h, FFh (portA)
OUT 331h, FFh (portB)
OUT 332h, FFh (portC)
or all "0"s after:
OUT 330h, 0 (portA)
OUT 331h, 0 (portB)
OUT 332h, 0 (portC)
EZ I/O input program examples
To configure ports A and C as inputs and port B as outputs, issue the
following commands:
OUT 333h, 2 'Direction Mode'
OUT 330h, 0
OUT 331h, FF
OUT 332h, 0
OUT 333h, 3
'Operation Mode'