G-8 Appendix G Date Code 20010518
SEL-2020 Instruction Manual
The master request must have the following format:
1 byte Slave Address
1 byte Function Code (11h)
2 bytes CRC-16 for Message
A successful SEL-2020 response will have the following format:
1 byte Slave Address
1 byte Function Code (11h)
1 byte Byte Count (7)
1 byte Slave ID (see following table)
1 byte Run Status
1 byte Fast Meter status
4 bytes Reserved (always 0)
2 bytes CRC-16 for Message
The reported slave ID is simply the sum (modulo-256) of the START_ID setting and the device
ID from the following table:
Slave ID 00 Unused Slave ID 18 SEL-151D/251D
01 Printer 19 SEL-167/267
02 Other IED 20 SEL-167D/267D
03 Unknown SEL IED 21 SEL-187V/287V
04 Master Port 22 SEL-279
05 SEL-49 23 SEL-279H
06 SEL-121 24 SEL-321
07 SEL-121-10 25 SEL-501
08 SEL-121B/221B 26 SEL-BFR/2BFR
09 SEL-121C/221C 27 SEL-PG10/2PG10
10 SEL-121D/221D 28 SEL-587
11 SEL-121F/221F 29 SEL-551
12 SEL-121G/221G 30 SEL-351
13 SEL-121H/221H 31 SEL-352
14 SEL-121S/221S 32 SEL-387
15 SEL-151/251 33 SEL-300G
16 SEL-151C/251C 34 SEL-351R
17 SEL-151CD/251CD
You would normally only offset this table, using START_ID, if you need the values to be unique
from the IDs of other devices on your Modbus network. The reported run status will be FFh if
the port is Active, 00h otherwise. The Fast Meter status indicates what data is being collected
using binary data collection. Possible values are:
0 No Fast Meter
1 Meter data only
3 Meter and Target data
7 Meter, Target, and Demand data
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