D.12
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Configuration, Fast Meter, and Fast Operate Commands
Message Definitions
A5ED Fast Operate
The Fast Operate Reset commands take the following form.
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)
Table D.12 A5ED Fast Operate Reset Command
Data Description
A5ED Command
06 Message Length - always 6
00 Operate Code (e.g., "00" for target reset, "TAR R")
01 Operate Validation - (4 + Operate Code) + 1
xx Checksum
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.
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