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3. MODBUS RTU requests description
MODBUS RTU requests used by the product are described below.
Note : Every data or address are transmitted MSB first. It means that the 32 bits word 0x01020304 is transmitted as
follow:
0x01
In case of an EEPROM data modification, user should have to update the CRC of EEPROM.
CRC calculation shall be done from address 0x0004 to address 0x063F (included). CRC calculation method is the same
as the method described in §
Result should be stored in EEPROM at address 0x0000.
Read holding registers request
This request is used to read data from product EEPROM. Available data are fully described in §
Request format:
Command
0x03
Field
Starting address
Qty of registers
Answer format in case of success:
Command
0x03
Field
Byte count
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Information contained in this document may be subject to Export Control Regulations of the European Union, USA or other countries. Each recipient of this document is responsible for ensuring that transfer or use of any
information contained in this document complies with all relevant Export Control Regulations.
Meggitt (Sensorex) se réserve le droit de modifier la présente notice sans préavis/ Meggitt (Sensorex) reserves the right to change the specification without any prior notice
NOTICE D'INSTRUCTION / INSTRUCTION MANUAL
NOT043045InterfaceProductB0
0x02
7 and is the same as the MODBUS RTU CRC16 calculation.
Starting address
2 bytes
Description
EEPROM Address to read (32bits aligned)
Number of register to read. Should be even.
Byte count
1 byte
Description
Number of byte of field « Registers values ». Is equal to 2 * « Qty of
registers »
0x03
0x04
Qty of register
CRC
2 bytes
2 bytes
Registers values
CRC
(Qty of register) *
2 bytes
2 bytes
6 .
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