IAI America XSEL-QX - Manual (Page 286)

262
Part 4 Commands
z IS (Compare strings)
Command, declaration
Extension condition
(LD, A, O, AB, OB)
Input condition
(I/O, flag)
Command,
declaration
Operand 1 Operand 2
Output
(Output, flag)
Optional Optional IS
Column
number
Column
number,
character literal
CP
[Function] Compare the character strings in the columns specified in operands 1 and 2, and proceed
to the next step if the condition is satisfied.
If the condition is not satisfied, the program will proceed to the step next to the
corresponding ELSE command, if any, or to the step next to the corresponding EDIF
command.
Comparison will be performed for the length set by a SLEN command.
If a character literal is specified in operand 2, comparison will be performed for the entire
length of the literal.
If the input condition is not satisfied and the IS
command is not executed, the program
will proceed to the step next to the EDIF.
A maximum of 15 nests are supported when IF
and DW are combined.
IS
EQ Operand 1 = Operand 2
NE Operand 1 z Operand 2
[Example 1] SCPY 10 ‘GOFD’ (Move
forward)
SCPY 14 ‘GOBK’ (Move
backward)
SLEN 4 Set the number of comparing characters to 4.
600 ISEQ 1 “AXSX” (X-axis) Select an axis.
ISEQ 5 10 Select a moving direction.
MOVL 1 Move the axis to position No. 1 in CP mode.
ELSE
MOVL 2 5 Move the axis to position No. 2 in CP mode.
EDIF
ELSE
ISNE 5 14 Select a moving direction.
MOVL 3 Move the axis to position No. 3 in CP mode.
ELSE
MOVL 4 Move the axis to position No. 4 in CP mode.
EDIF
EDIF
Move in CP mode by selecting position Nos. 1 and 2 by columns 1 to 4 and
position Nos. 3 and 4 by columns 5 to 8.
Nothing will happen if flag 600 is OFF, in which case the program will proceed to
the step next to the last EDIF.
If columns 1 to 8 contain the following data, the axis will be moved to position
No. 1 in CP mode.
1 2 3 4 5 6 7 8
AX SX GO FD
(Note) Using a GOTO command to branch out of or into an IS -EDIF syntax is prohibited.