Schweitzer Engineering SEL-2032, Instruction Manual

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7.14
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
Settings
Automatic Message (SET A) Settings
Data
Parsing Options
The SEL-2032 database stores data that are parsed, or separated, into the
smallest useful element or bit size. Parsing data in the SEL-2032 reduces the
communication and processing burden for other devices or systems that use
these data by permitting them to request and transfer only the specific data
they need.
The SEL-2032 automatically parses data that are recognized from SEL relays.
You request these data using the “20” message format. The type of response
depends on the SEL relay’s capability. If the relay has Fast Meter capability,
the response to the 20METER message is in a binary format. Some relays also
respond to 20TARGET and 20DEMAND messages with a binary data format.
Binary data are transferred faster than ASCII data and allow simultaneous
ASCII dialogue, making Fast Meter binary data transfer the preferred choice
whenever possible.
The SEL-2032 also automatically calculates additional metering parameters
from the binary data. For example, ASCII meter data provide current and
voltage magnitude, but the binary meter data results include magnitude and
angle. Binary meter data also include calculated voltage and current sequence
quantities, calculated per-phase watts and vars, and three-phase watts and
vars.
You can parse message responses that are not recognized SEL data in several
ways. You can set the SEL-2032 to ignore the data by setting PARSE
x = 0. Or
you can set the SEL-2032 to accept the data and parse it according to one of
the six techniques listed below. If DEVICE is set to SEL and the connected
device echoes the request message, parsing begins after the echoed request is
received.
ASCII Integer (Parse = 1)
This technique parses numbers only; every number separated by a space,
comma, decimal, or any other nonnumeric character is stored as a separate
item. For example, if you selected the ASCII Integer option, and set the
number of responses (NUM
x ) to 7, the following message is parsed as shown
below:
Message: “This is a 2030 message with numbers 10, -6.2, and 2,459.884”
Parsed result: “2030, 10, -6, 2, 2, 459, 884”
If you set the number of responses less than 7, the parsed result is truncated; if
you set the number of responses greater than 7, the result includes trailing
zeroes, i.e., “..., 884, 0, 0, 0.”
ASCII Float (Parse = 2)
This technique also parses numbers only, but retains decimals as part of each
number. All other nonnumeric characters are parsing characters. For example,
if you selected the ASCII Float option and set the number of responses
(NUM
x ) to 5, the following message is parsed as shown below:
Message: “This is a 2030 message with numbers 10, -6.2, and 2,459.884”
Parsed result: “2030, 10, -6.2, 2, 459.884”
If you set the number of responses less than 5, the parsed result set is
truncated; if you set the number of responses greater than 5, the result includes
trailing zeroes, i.e., “..., 459.884, 0, 0, 0.”
Courtesy of NationalSwitchgear.com