Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Appendix C
Instruction Manual
SEL Communications Processors
SEL Communications Protocols
The SEL-2414 Transformer Monitor supports SEL protocols and command sets
shown in Table C.1.
SEL ASCII Commands
We originally designed SEL ASCII commands for communication between the
device and a human operator via a keyboard and monitor or a printing terminal. A
computer with a serial port can also use the SEL ASCII protocol to communicate
with the device, collect data, and issue commands.
SEL Compressed
ASCII Commands
The SEL-2414 supports a subset of SEL ASCII commands identified as Com-
pressed ASCII commands. Each of these commands results in a comma-delim-
ited message that includes a checksum field. Most spreadsheet and database
programs can directly import comma-delimited files. Devices with embedded
processors connected to the device can execute software to parse and interpret
comma-delimited messages without expending the customization and mainte-
nance labor needed to interpret nondelimited messages. The device calculates a
checksum for each line by numerically summing all of the bytes that precede the
checksum field in the message. The program that uses the data can detect trans-
mission errors in the message by summing the characters of the received message
and comparing this sum to the received checksum.
Most commands are available only in SEL ASCII or Compressed ASCII format.
Selected commands have versions in both standard SEL ASCII and Compressed
ASCII formats. Compressed ASCII reports generally have fewer characters than
conventional SEL ASCII reports because the compressed reports reduce blanks,
tabs, and other white space between data fields to a single comma.
Table C.1 Supported Serial Command Sets
Command Set Description
SEL ASCII Use this protocol to send ASCII commands and receive ASCII
responses that are human readable with an appropriate terminal
emulation program.
SEL Compressed ASCII Use this protocol to send ASCII commands and receive Com-
pressed ASCII responses that are comma-delimited for use with
spreadsheet and database programs or for use by intelligent elec-
tronic devices.
SEL Fast Meter Use this protocol to send binary commands and receive binary
meter and target responses.
SEL Fast Operate Use this protocol to receive binary control commands.
SEL Fast SER Use this protocol to send binary Sequential Events Recorder
unsolicited responses.
SEL Fast Message Use this protocol to write Remote Analog data via unsolicited
writes.
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