Date Code 20010518 General Description 2-15
SEL-2020 Instruction Manual
NUMn
If you choose to store the unrecognized data using one of the parsing options in the PARSEn
setting, the SEL-2020 will prompt you to set a limit on the amount of data stored using the
NUMn setting.
DELAYn
This setting is used with non-ā20ā messages to determine the method for detecting the end of the
incoming message. In the default case, ON, the SEL-2020 will wait for a 15 second idle time
before considering the message to be complete. The idle time is 5 seconds on other IED ports.
When set OFF, the SEL-2020 will only wait until it has received the desired number of data
items.
CHECKn
If the message being parsed contains a checksum, use this and the related settings that follow to
enable the SEL-2020 to verify the message contents. This setting specifies the type of checksum
that will be used to verify the message (8-bit, 16-bit, or CRC-16) as well as the checksum format
(ASCII hexadecimal or binary). If the message does not contain a checksum or you do not care
to verify it, this setting should be set to NONE.
ORDERn
If CHECKn is set for 16-bit checksum or CRC-16, this setting specifies the byte order of the
checksum in the received message: high byte first or low byte first.
STARTn
This setting specifies a position in the received message where the checksum calculation begins.
A numeric position in the string, or a specific character or character code, can be used to specify
this setting.
STOPn
This setting specifies the position in the received message where the checksum calculation ends.
Like the STARTn setting, this setting can be set using either a numeric position or a character
code.
CHKPOSn
This setting specifies the checksum location in the received message. Either a character code or
a numeric position in the string can be used to specify the location.
ACKn
This setting specifies the Acknowledge string to be sent when the checksum in the received
message is valid.
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