Date Code 20010518 Message Strings 8-3
SEL-2020 Instruction Manual
Table 8.2: Special Message Sequences for Strings
Character Comments
\CSx/ Begin checksum calculation.
x specifies checksum type.
c=CRC-16. Based on the polynomial X
16
+ X
15
+ X
2
+ 1
b=8-bit checksum. Sum all bytes and take least significant byte.
w=16-bit checksum. Sum all bytes and take two-byte result.
\CE/ Stop checksum calculation.
\COyz/ Output checksum.
y specifies format.
a=ASCII-hexadecimal.
b=binary.
x=binary with XON/XOFF encoding
z specifies byte order.
h=high byte first.
l=low byte first.
\DA[C][P]n/ Output unsolicited message queue data for Port n.
C= if included, clear the queue after the read.
P= if included, only read characters that have been added to
the unsolicited message queue since the last time the
message queue was read. P and C options are mutually
exclusive.
\Dt/ Data item output for READACK setting (SET U).
t specifies the data format.
b=binary word (2 bytes).
h=ASCII-hexadecimal word (4 digits).
c=binary bytes (1 byte).
g=ASCII-hexadecimal byte (2 digits).
\Fp:r[;C[A]]/ Output formatted region data.
p=the port number.
r=the data region.
;C=clear archive item after it is read.
;CA= read the entire queue of records from an archive region and
clear them as they are read.
CAUTION
!
Frequent archive record clearing may exceed
EEPROM capabilities. See the discussion in
the Archive Data Region subsection of Section
9: Database. If you completely clear an
archive region that contains a large number of
records (thousands of records), it may take a
few minutes for the clearing to complete.
During this time, most SEL-2020 automatic
data collection will be suspended.
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