Actel ARTU Series, Installation And Operation Manual

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15
Lower machine abnormal reply (MODBUS 83H/84H function)
Address Corresponding
error function Exception error code data CRC check
BYTE BYTE BYTE WORD
XX XX
（
83H/84H
）
XX (02H address error, 03H data error) XXXX (CRC check value)
6.2.4 Status of mandatory alarm by using Modbus 05H function
Reading required by the upper computer (MODBUS 05H function)
Address Function Address Data CRC check
BYTE BYTE WORD WORD WORD
XX XX
（
05H
）
XXXX 0ff00H or 0000H XXXX (CRC check value)
Lower machine reply (MODBUS 05 function)
Address Function Address Data CRC check
BYTE BYTE WORD WORD WORD
XX XX
（
05H
）
XXXX (same as
requested by the
upper computer) XXXX (same as
requested by the
upper computer) XXXX (CRC check value)
Lower machine abnormal reply (MODBUS 85H function)
Address Corresponding
error function Exception error code data CRC check
BYTE BYTE BYTE WORD
XX XX
（
85H
）
XX (02H address error, 03H data error) XXXX (CRC check value)
6.2.5 Write multiple data by using Modbus 10H function
Write multiple data as requested by the upper computer (MODBUS 16 (10H) function)
Address Function Start
address Number
of data Data length Data CRC check
BYTE BYTE WORD WORD BYTE 2*N BYTE WORD
XX XX
（
10H
）
XXXX XXXX
（
n
）
XX
（
2*n
）
XXXX……
. XXXX (CRC check
value)
Lower machine reply (MODBUS 16 (10H) function)
Address Function Start address Number of data CRC check
BYTE BYTE WORD WORD WORD
XX XX
（
10H
）
XXXX XXXX XXXX (CRC check value)
Lower machine abnormal reply (MODBUS 90H function)
Address Corresponding
error function Exception error code data CRC check
BYTE BYTE BYTE WORD
XX XX
（
90H
）
XX (02H address error, 03H data error,
04 writing not allowed) XXXX (CRC check
value)
7 Communication Connection Modes
When multiple ARTUs are used in networking, an terminal matching resistor R shall be connected in parallel on