Remote Processing CAMBASIC - Manual (Page 125)

Comm ands - 92
OPTO
Process Statement
SYNTAX: OPTO channel, value
PURPOSE: To turn output modules on and off on 24 position opto-isolator racks that are external to the card.
REMARK S: The channel parameter r anges from 0 to 23 (0-3 on RPC -30) or 100 to 123 and corresponds to the
position numbers on the opto-module ra cks.
The value is the state of the output. To turn an output on, enter a 1 or ON . To tur n the output off,
enter a 0 or OF F. The ON and O FF execute faster than 1 or 0.
Inputs and outp uts are ac tive low w hen interf acing 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 statement. It
automatically inverts the logic so that a “1” represents on and a “0” represents off.
The OPT O statement is similar to the BIT statement in that individual I/O bits or channels can be
controlled. It differs in that it is used specifically with opto-isolator racks and it executes much
faster.
RELATED: OPTO function
EXAMPLE: 10 OPTO 3,ON
20 PRINT OPTO(103)
RUN
1
In this example channel 3 was turned on. Thus, a 1 is returned.
ERROR: < Data negative> – channel and value
< Data out of range> - if channel > 23 or value > 1 o r O N / O F F