socomec ITYS PRO Series, Installation And Operating Manual

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52 EN
MODBUS RTU / MODBUS TCP for Modulys GP 2.0 - ITYS PRO UPS - Masterys GP4 UPS - Masterys BC+ UPS range - Ref.: IOMXXXOPXX00-EN 00
9. MODBUS PROTOCOL
9.1 Functions used
0x03 READ data
0x06 WRITE command or one word
0x10 Set UPS Clock – write several words
9.2 Summary of frame format
Function 0x03: bytes frame description
Slave Function Address Length CRC
1
0x03
MSB LSB MSB LSB MSB LSB
By default MODBUS TABLE Number of words Computed
Answer
Slave Function Nb bytes Data CRC
1 0x03
2 * nb of
words
MSB LSB MSB LSB
Values …. Computed
Function 0x06: bytes frame description
Slave Function Address Data CRC
1
0x06
MSB LSB MSB LSB MSB LSB
By default MODBUS TABLE Value to write Computed
Answer
Slave Function Address Data CRC
1 0x06
MSB LSB MSB LSB MSB LSB
MODBUS TABLE Value to write Computed
Function 0x10: bytes frame description
Slave Function Address Length Length Data CRC
1
0x10
MSB LSB MSB LSB MSB LSB MSB LSB
By
default
MODBUS
TABLE
Number of words to
write
Number of
bytes
Values to write Computed
Answer
Slave Function Address Length CRC
1 0x10
MSB LSB MSB LSB MSB LSB
MODBUS TABLE Nb of words written Computed