9.19
Date Code 20120126 Instruction Manual SEL-2032 Communications Processor
Protocols
Modbus RTU Protocol
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-2032 response has 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 Table 9.7 .
Table 9.7 Device ID (Sheet 1 of 2)
Slave ID Description
00 Unused
a
01 Printer
a
02 Other IED
a
03 Unknown SEL IED
a
04 Master Port
a
05 SEL-49
06 SEL-121
07 SEL-121-10
08 SEL-121B/221B
09 SEL-121C/221C
10 SEL-121D/221D
11 SEL-121F/221F
12 SEL-121G/221G
13 SEL-121H/221H
14 SEL-121S/221S
15 SEL-151/251
16 SEL-151C/251C
17 SEL-151CD/251CD
18 SEL-151D/251D
19 SEL-167/267
20 SEL-167D/267D
21 SEL-187V/287V
22 SEL-279
23 SEL-279H
Courtesy of NationalSwitchgear.com