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Remote-processing BASIC for the CX-10 Modbus Manual de usuario Pagina 72

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BASIC PROGRAMMING GUIDE
2-63
Syntax: A = STR(7,$(
put
),$(
get
),
position,length
)
Description:
Extracts a portion of a string from $(
get
) and transfers it over to $(
put
). The actual number of characters
moved is returned.
position
starts at 1. When
position
is 0, no characters are placed into $(
put
) regardless of
length
. When
length
is 0, all characters are copied from $(
get
) to $(
put
) starting at
position.
Example:
10 STRING 200,20
20 $(0) = "123456.789"
30 A = STR(7,$(1),$(0),3,5)
40 PRINT $(1)
50 PRINT "Length:",A
run
3456.
Length: 5
Syntax: A = STR(8,$(
search
),$(
substring
))
Description:
Scans $(
search
) for occurrence of
substring
. Returns position where entire
substring
first matches
search
string. Returns 0 when
substring
is not in
search
string.
Example:
10 STRING 200,20
20 $(0) = ">05M34C3"
30 $(1) = "05M"
40 A = STR(8,$(0),$(1))
50 PRINT "Position match at:",a
run
Position match at: 2
The number '0' in $(1) matches $(0) at position 2.
Syntax: A = STR(9,$(
string1
),$(
string2
))
Description:
Compares
string1
to
string2
. Returns position of first mismatch. If both strings exactly match, then 0 is
returned.
Example:
10 STRING 200,20
20 $(0) = ">05M34C3"
30 $(1) = ">05"
40 A = STR(9,$(0),$(1))
50 PRINT "Mismatch starting at:",a
run
Mismatch starting at: 4
Since the first three character positions matched, position 4 is returned as the longer string did not match the
shorter one.
String functions 8 and 9 are useful in RS-485 network communication. In the above example, ">05" could be
the RPC-320's address. Knowing the mismatch starts at position 4, the address can be assumed correct. If the
mismatch started sooner, a smaller number is returned. Hence, the message was not intended for this
particular card and the entire message can be flushed.
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