GE MM300 Manual page 75

CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
For example, if the values of MOTOR LOAD (register address 014FH; modbus address
30336) and DRIVE STATUS (register address 0135H; modbus address 30310) are required to
be read from a MM300, their addresses may be re-mapped as follows:
1. Write 30336 to address 020BH (40524) (User Definable Register Index 0000) using
function code 06 or 16.
2. Write 30310 to address 020CH (40525) (User Definable Register Index 0001) using
function code 06 or 16.
The MM300PC software can be used to write these locations to the User Definable Register
Index using the Setpoints > Modbus Memory Map > User Map screen.
It is now possible to read these two data registers with one read, at addresses 020BH,
020CH. Address 020BH will contain MOTOR LOAD. Address 020CH will contain DRIVE
STATUS.
PERFORMING COMMANDS USING FUNCTION CODE 10H
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