Date Code 20010518
Settings
6-17
SEL-2020 Instruction Manual
When connecting to SEL 100 and 200 series relays that have
Fast Meter
binary data capability,
always connect to Port 2 on the relay. Binary data transfer is not supported on Port 1 of these
relays.
Collection periods for non-“20” message-based collections are dependent on the device response
speed and the value of the DELAY setting. As a minimum, the collection period will always
contain the time required to send a request and receive the response. If DELAY is set ON, there
will be an additional delay while the SEL-2020 waits for the port to be idle for 15 seconds on
SEL-IED ports and 5 seconds on all other ports.
Data Parsing Options
The SEL-2020 database stores data that are parsed, or separated, into the smallest useful element
or bit size. Parsing data in the SEL-2020 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-2020 automatically parses data that are recognized from SEL relays. You request these
data using the “20” message format. The type of response will depend 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-2020 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 per-phase watts
and vars, in addition to the three-phase watts and vars.
You can parse message responses that are not recognized SEL data in several ways. You can set
the SEL-2020 to ignore the data by setting PARSEx = 0. Or you can set the SEL-2020 to accept
the data and parse it according to one of the five 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 (NUMx) to 7, the following message is parsed as
shown below:
Message: “This is a 2020 message with numbers 10, -6.2, and 2,459.884”
Parsed result: “2020, 10, -6, 2, 2, 459, 884”
If you set the number of responses less than 7, the parsed result will be truncated; if you set the
number of responses greater than 7, the result will include trailing 0s, i.e. “..., 884, 0, 0, 0”.
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