Schweitzer Engineering Laboratories SEL-751 - Table E.23 60 H Read Parameter Descriptor Field Definition; Table E.24 60 H Read Parameter Conversion Field Definition

E.13
Date Code 20170927 Instruction Manual SEL-751 Relay
Modbus RTU Communications
Communications Protocol
The Parameter Descriptor field is defined in Table E.23.
The Parameter Conversion field is defined in Table E.24.
A successful response from the slave will have the following format:
1 byte Slave Address
1 byte Function Code (60h)
2 bytes Parameter Number
1 byte Parameter Descriptor
1 byte Parameter Conversion
2 bytes Parameter Minimum Settable Value
2 bytes Parameter Maximum Settable Value
2 bytes Parameter Default Value
2 bytes CRC-16
Table E.23 60h Read Parameter Descriptor Field Definition
Bit Name Description
0 RO: Read-only 1 when the setting is read-only
1 H: Hidden 1 when the setting is hidden
2 DBL: 32-bit 1 when the following setting is a fractional value of this setting
3 RA: RAM-only 1 when the setting is not saved in nonvolatile memory
4 RR: Read-only
if running
1 when the setting is read-only if in running/operational state
5 P: Power Cycle
or Reset
1 when the setting change requires a power cycle or reset
60 Reserved
7 Extend Reserved to extend the descriptor table
Table E.24 60h Read Parameter Conversion Field Definition (Sheet 1 of 2)
Conversion
Value
Type Multiplier Divisor Offset Base
0 Boolean 1 1 0 1
1 Unsigned Integer 1 1 0 1
2 Unsigned Integer 1 10 0 1
3 Unsigned Integer 1 100 0 1
4 Unsigned Integer 1 1000 0 1
5 Hexidecimal 1 1 0 1
6Integer 1101
7 Integer 1 10 0 1
8 Integer 1 100 0 1
9 Integer 1 1000 0 1
Table E.22 60h Read Parameter Information Command (Sheet 2 of 2)
Bytes Field