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GE Power Management 469 Motor Management Relay 6-15

6 COMMUNICATIONS 6.3 ERROR RESPONSES

6.3 ERROR RESPONSES 6.3.1 DESCRIPTION

When an 469 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 469.

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 469 implements the following exception response codes.

01 - ILLEGAL FUNCTION

The function code transmitted is not one of the functions supported by the 469.

02 - ILLEGAL DATA ADDRESS

The address referenced in the data field transmitted by the master is not an allowable address for the 469.

03 - ILLEGAL DATA VALUE

The value referenced in the data field transmitted by the master is not within range for the selected data

address.

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