Allen-Bradley 825-P - Read Enumeration Text Command

142 Rockwell Automation Publication 825-UM004D-EN-P - November 2012
Chapter 10 Modbus RTU Communications
62h Read Enumeration
Text Command
The 825-P uses this function to allow a Modbus master to read parameter
enumeration or bit enumeration values (setting lists) from the relay. One
parameter enumeration is read in each query.
Table 80 - 62h Read Enumeration Text Command
The relay responses to errors in the query are shown below:
Table 81 - 61h Read Parameter Enumeration Text Query Error Messages
Bytes Field
Requests from the master must have the following format:
1 byte Slave Address
1 byte Function Code (62h)
2 bytes Parameter Number
1 byte Enumeration Index
2 bytes CRC-16
A successful response from the slave will have the following format:
1 byte Slave Address
1 byte Function Code (62h)
2 bytes Parameter Number
1 byte Enumeration Index
16 bytes Enumeration Text
2 bytes CRC-16
Error Error Code Returned Communication
Counter Increments
Illegal parameter to read Illegal Data Value (03h) Illegal Register