C.9 Message ExamplesBelow are some examples of command and response messages.u Reading Drive MEMOBUS/Modbus Register ContentsUsing the function code 03H (Read), a maximum of 16 MEMOBUS/Modbus registers can be read out at a time.The following table shows message examples when reading status signals, error details, data link status, and frequencyreferences from the slave 2 drive.Command Message Response Message (normal) Response Message (fault)Slave Address 02H Slave Address 02H Slave Address 02HFunction Code 03H Function Code 03H Function Code 83HStarting No. Upper 00H Data Quantity 08H Error Code 03HLower 20H 1st storageregisterUpper 00H CRC-16 Upper F1HData Quantity Upper 00H Lower 65H Lower 31HLower 04H Next storageregisterUpper 00HCRC-16 Upper 45H Lower 00HLower F0H Next storageregisterUpper 00HLower 00HNext storageregisterUpper 01HLower F4HCRC-16 Upper AFHLower 82Hu Loopback TestFunction code 08H performs a loopback test. This test returns a response message with exactly the same content as the commandmessage and can be used to check the communications between the master and slave. User-defined test code and data valuescan be set.The following table shows a message example when performing a loopback test with the slave 1 drive.Command Message Response Message (normal) Response Message (fault)Slave Address 01H Slave Address 01H Slave Address 01HFunction Code 08H Function Code 08H Function Code 89HTest Code Upper 00H Test Code Upper 00H Error Code 01HLower 00H Lower 00H CRC-16 Upper 86HData Upper A5H Data Upper A5H Lower 50HLower 37H Lower 37HCRC-16 Upper DAH CRC-16 Upper DAHLower 8DH Lower 8DHC.9 Message ExamplesYASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual 221C MEMOBUS/ModbusCommunicationshttp://nicontrols.com
