Schweitzer Engineering Laboratories SEL-2020 - Page 208

6-26 Settings Date Code 20010518
SEL-2020 Instruction Manual
Table 6.11: SET A Automatic Message Settings Information (continued)
Setting Comment
MESG1-12
Prompt. Item 1-12 message.
Description. You enter the message string to be sent when the associated ISSUE condition
is met. Each message is limited to 1000 characters. Use the \ symbol at the end of a line
and press <ENTER> to continue on the next line.
PARSE1-8
Prompt. Item 1-8 response parsing method (0=IGNORE, 1=ASCII_INT,
2=ASCII_FLOAT, 3=CHAR_STRING, 4=INT_STRING, 5=INT_STRX).
Description. You select the parsing option to be used for the message response. For
Masters and Printers, the parsing option is always forced to IGNORE. Parsing is
automatically set for SEL relays if the message string is a recognized “20” command.
NUM1-8
Prompt. Item 1-8 number of data items.
Description. You enter the maximum number of items the SEL-2020 may store from the
response. The limit is determined by the type of data and the size of the associated region.
See Section 9: Database for more information on region sizes.
DELAY1-12
Prompt. Item 1-12 time delay to allow response to complete (OFF, ON).
Description. If you know you are collecting the entire response, use the OFF setting to
avoid unnecessary delays. Otherwise, use the ON setting so the response does not confuse
subsequent data collections.
CHECK1-8
Prompt. Checksum verification (N=NONE, 8A=8BIT ASCII, 8B=8BIT Binary,
16A=16BIT ASCII, 16B=16BIT Binary, CA=CRC16 ASCII, CB=CRC16 Binary).
Description. You select the verification method you wish to use to confirm that the data
was accurately transmitted over the data channel. The data must contain a validation code
of this same type and format. Otherwise, select NONE.
ORDER1-8
Prompt. Checksum byte order(H=High byte first, L=Low byte first)
Description. You enter the ordering of the bytes in the received validation code. Does not
apply to 8-bit (single-byte) checksums.
START1-8
Prompt. Position or character where verification will start.
Description. You enter the position in the received data where the checksum validation
should begin. This position can be an index from the start, an index from the end, or a
specific character.
STOP1-8
Prompt. Position or character where verification will stop.
Description. You enter the position in the received data where the checksum validation
should end. This position can be an index from the start, an index from the end, or a
specific character.
CHKPOS1-8
Prompt. Position or character where checksum located.
Description. You enter the position in the received data where the validation code will be
located. This position can be an index from the start, an index from the end, or a specific
character.
ACK1-8
Prompt. Acknowledge string.
Description. You define the string to send to the connected device when the data received
from it passes the checksum verification. This string is limited to 10 characters.
NACK1-8
Prompt. Negative Acknowledge string.
Description. You define the string to send to the connected device when the data received
from it does not pass the checksum verification. This string is limited to 10 characters.