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COMMUNICATIONS GUIDE RS485 INTERFACE (MODBUS RTU)
MM200 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE 11
2. Write 30310 to address 020CH (40525) (User Definable Register Index 0001) using
function code 06 or 16.
The MM200PC 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.
Error Responses When a MM200 detects an error other than a CRC error, a response will be sent to the
master. The MSBit of the FUNCTION CODE byte will be set to 1 (i.e. the function code sent
from the slave will be equal to the function code sent from the master plus 128). The
following byte will be an exception code indicating the type of error that occurred.
Transmissions received from the master with CRC errors will be ignored by the MM200.
The slave response to an error (other than CRC error) will be:
SLAVE ADDRESS: 1 byte
FUNCTION CODE: 1 byte (with MSbit set to 1)
EXCEPTION CODE: 1 byte
CRC: 2 bytes
The MM200 implements the following exception response codes:
01 - ILLEGAL FUNCTION
The function code transmitted is not one of the functions supported by the MM200.
02 - ILLEGAL DATA ADDRESS
The address referenced in the data field transmitted by the master is not an allowable
address for the MM200.
03 - ILLEGAL DATA VALUE
The value referenced in the data field transmitted by the master is not within range for the
selected data address.
Modbus memory map
Modbus Hex Description Min Max Step Units Format Default Size in
Words
ACTUAL VALUES
PRODUCT INFORMATION
30001 0000 Product Device Code --- --- --- --- F22 N/A 1
30002 0001 Hardware Revision --- --- --- --- F15 N/A 1
30003 0002 Firmware Version --- --- --- --- F3 N/A 1
30004 0003 Reserved --- --- --- --- --- --- 1
30005 0004 Modification Number --- --- --- --- F1 N/A 1
30006 0005 Boot Version --- --- --- --- F3 N/A 1
30007 0006 Reserved --- --- --- --- --- --- 1
30008 0007 Serial Number --- --- --- --- F22 N/A 6
30014 000D Order Code --- --- --- --- F22 N/A 16
30036 0023 Reserved --- --- --- --- --- --- 1