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Commands - 91

OPTO

Process Function

SYNTAX: a = OPTO (channel)

PURPOSE: To return the status of an input on an on board opto isolator rack.

REMARK S: Inputs and outputs are active low when interfacing with op to-isolator r acks. Thus, writing a “1” to

an opto output module will turn it off. This confusion is eliminated with the OPTO function. OPTO

automatically inverts the logic so that a “1” represents ON and a “0” represents OFF.

The OPT O function is similar to the BIT function in that individual I/O bits or channels can be read.

It differs in that it is used specifically with opto-isolator racks and it executes much faster.

The channel parameter ranges from 0 to 23 (0-3 on the RPC-30) or 100 to 123 and the channel

number corresponds to the position numbers on the opto module racks.

EXAMPLE: 20 PRINT OPTO(0)

RUN

In this example the bit 0 of the port at address 0 was set high. Since the OPTO function inverts the

result, a “0” w as retur ned. This would mean th at there w as not input signal at an opto module in

this location.

ERROR: < Data negative> – channel

< Illegal argument> - if channel > 23

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Remote-processing CAMBASIC Manuale Utente Pagina 124