RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
322
innovators for industry
Undelayed
Short
List Command
list_jump_rel_cond
Function
Conditional (relative) list jump
: This command executes the command
Pos
), if the current
IOvalue
at the EXTENSION 1 connector’s 16-bit digital
input port meets the following condition:
((IOvalue AND
Mask1
) =
Mask1
) AND (((not IOvalue) AND
Mask0
) =
Mask0
)
(i.e. if the bits specified in
Mask1
are
1
and the bits specified in
Mask0
are
0
). Otherwise, the
directly following list command will be immediately executed.
Call
list_jump_rel_cond( Mask1, Mask0, Pos )
Parameters
Mask1,
Mask0
16-bit masks as unsigned 32-bit values
(only the least significant 16 bits are evaluated)
Pos
Jump distance [(–2
20
+1) … (2
20
–1)] as a signed 32-bit value
Comments
• See
• Unlike the rules for preventing endless loops (see
), jumps via
list_jump_pos_cond
are allowed even if they are to their own address (
Pos
= 0), e.g.
to wait for confirmation of a signal.
• Also see
"Conditional Command Execution", page 213
.
Examples
(Pascal)
• wait until bit #3 of the input port turns HIGH (= loop while the bit is
LOW
):
list_jump_rel_cond
(0, $0008, 0);
• skip the next two list commands if the state of the input port is
xxxx xxxx xxxx 0110
:
list_jump_rel_cond
(6, 9, 3);
• Also see
"Programming Examples", page 214
.
RTC
®
4
RTC
®
5 new command
References
Normal
List Command
list_nop
Function
inserts a null operation (no operation) into the list buffer
Call
list_nop()
Comments
• The
list_nop
command works like
(1). It switches off the “laser active” laser
control signals after a LaserOff delay and waits for a possible scanner delay. Even if no
delays need to be waited for, execution of the command requires 10
µ
s.
• The command serves as a placeholder for rejected list commands (
return
code:
RTC5_IGNORED
).
• When this command immediately follows a short list command, it ensures that the
subsequent list command only executes in the next 10
µ
s clock period (the short list
command’s “effective“ execution time is then 10
µ
s).
RTC
®
4
RTC
®
5 essentially unchanged functionality, but switches off the “laser active” laser control signals
(see above).
References
