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ACS CFSound-IV BASIC Programming Manual
1 October 2015
@CLOSURE[x]
The @CLOSURE[x] system variables allow the ACS BASIC program to access the CFSound and
Expansion Module contact events.
There are up to 56 contact inputs; permissible values for [x] are 0 through 55.
Reading the variable returns a ‘1’ if the input contact[x] has had a closure since last being read.
Closures are ‘sticky’ and the program must ‘clear’ the closure by assigning it a zero before it can be
detected again.
Optionally an event handler specified with the ONEVENT statement may be activated upon an
input closure, which automatically clears the closure.
10 ONEVENT @CLOSURE[0],GOSUB 100
20 ONEVENT @CLOSURE[1],GOSUB 200
30 GOTO 30
100 PRINT "contact 0 closed":RETURN
200 PRINT "contact 1 closed":RETURN
Ready
run
contact 0 closed
contact 1 closed
@OPENING[x]
The @OPENING[x] system variables allow the ACS BASIC program to access the CFSound and
Expansion Module contact events.
There are up to 56 contact inputs; permissible values for [x] are 0 through 55.
Reading the variable returns a ‘1’ if the input contact[x] has had an opening since last being read.
Openings are ‘sticky’ and the program must ‘clear’ the opening by assigning it a zero before it can
be detected again.
Optionally an event handler specified with the ONEVENT statement may be activated upon an
input opening, which automatically clears the opening.
@PTT
Writing this system variable to a non-zero value activates the CFSound-IV PTT relay. Setting it to
zero deactivates the PTT relay. Reading this system variable returns 1 if the PTT relay is active, else
zero.
File Information
The following system variables provide information about previously opened files:
@FILE.SIZE[#N]
The @FILE.SIZE[#N] read-only system variable allows the ACS BASIC program to determine the
size in bytes of a previously opened file #N.
@FILE.POSITION[#N]
The @FILE.POSITION[#N] system variable allows the ACS BASIC program to ascertain or set
the position of the next file read or write operation of a previously opened file #N.
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