D.13
Date Code 20050919
Instruction Manual
SEL-387-0, -5, -6 Relay
Configuration, Fast Meter, and Fast Operate Commands
Message Definitions
A546 Temperature
The SEL-387 understands the contents of the following binary data packet
from an external SEL-2600A RTD module.
ID Command
In response to the
ID
command, the relay sends the firmware ID, the relay
TID setting, and the Modbus
®
device code, as described below.
<STX> (STX character, 02)
"FID STRING ENCLOSED IN QUOTES","yyyy"<CR>
"ID SETTING ENCLOSED IN QUOTES","yyyy"<CR>
32,"yyyy"<CR>
<ETX> (ETX character, 03)
DNA Command
In response to the
DNA
command, the relay sends names of the Relay Word
bits, as described below:
<STX> (STX character, 02)
"xxxxxx","xxxxxx","xxxxxx","xxxxxx","xxxxxx","xxxxxx","xxxxxx","xxxxxx","yyyy"<CR>
... (49 more [50 more for SEL-387-6 Relay], where xxxxxx is a relay word element
name)
<ETX> (ETX character, 03)
Table D.13
A546 Temperature Data Block
(SEL-387-5 and SEL-387-6)
Data
Description
0xA546
Header code to flag the beginning of message
74h
Message length (116 bytes)
0000000000h
Routing value: 0 for point-to-point communication
00h
Status byte
12h
Function code: unsolicited read response
00h
Sequence byte
00h
Pad byte
xxxxxxxx
Internal time since power up or rollover at 86400000 milliseconds
xxxx
External RTD Unit Status: Bit 0 indicates the state of the external RTD
power supply (0 = good, 1 = fail). Bit 1 indicates the state of the exter-
nal RTD RAM (0 = good, 1 = fail). Bits 2–14 are 0. Bit 15 indicates the
state of the external RTD’s digital input (0 = deasserted, 1 = asserted).
xxxx * 4 * 12
Temperature Data (°C) in 12 data sets of 4 words.
Word One-16 bit representation of a PT100 RTD.
Word Two-16 bit representation of a NI100 RTD.
Word Three-16 bit representation of a NI120 RTD.
Word Three-16 bit representation of a CU10 RTD.
This set is repeated 12 times.
Open / Shorted RTDs are processed by the RTD diagnostic module.
yyyy
CRC-16 Block Check Code.
where:
yyyy
= the 4-byte ASCII representation of the hex checksum for
the line
32
= the device code used by the SEL-2030 to identify the
relay to Modbus users.
Содержание SEL-387-0
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