Eaton PowerXL DF1 Series, User Manual

Page: 173 / 284

173
5. Parameter Description
Eaton Electric General Inverters DF1 Series UMXXXXXXXXE February 2020 www.eaton.com
ASCII mode’s LRC check value calculation:
LRC check is simpler and it is used in the ASCII mode for checking the content of the message domain, excluding
the colon at the beginning and the line change enter symbol at the end. It only sums up all the data to be transmit-
ted according to the bite (not the ASCII code). If the result is greater than H100 of the hexadecimal digit, remove the
exceeded part (e.g., if the result is H136 of the hexadecimal digit, then take H36 only) and add one.
RTU mode, CRC check value calculation:
1
．
Add one hexadecimal digit register. All the digits are 1.
2
．
Carry out XOR calculation for the higher bit of the hexadecimal digit register and the eight bits. The calculated result is
entered to the hexadecimal digit register.
3
．
Shift this hexadecimal digit register one bit to the right.
4
．
If the right shifted bit (the marked bit) is 1, then polynomial 1010000000000001 and this register will carry out the
XOR calculation. If the right shifted bit is 0, then it will return to 3.
5
．
Repeat 3 and 4 until 8 bits are shifted.
6
．
The other eight bits and the hexadecimal register carry out the XOR calculation.
7
．
Repeat 3~6 until all the bytes of the text carry out the XOR calculation with the hexadecimal register and was shifted
for eight times.
8
．
The hexadecimal register content is the 2-byte CRC error checking, and it is added to the highest valid bit of the text.
When CRC is added to the message, lower bytes are added first, followed by the higher bytes.
• Communication format:
1. Data read-out (H03)
Mode Start Address*1) Function*2) Start Address*3) Number of register*4) Check Stop
ASCII H3A 2char 2char 4char 4char 2char 0D 0A
RTU >=10ms 8bit 8bit 2byte 2byte 2byte >=10ms
Regular response
Mode Start Address*1) Function*2)
Read-out data
number *5)
Read-out data*6) Check Stop
ASCII H3A 2char 2char 2char 4char …2N×8bit 2char 0D 0A
RTU >=10ms 8bit 8bit 1byte 2byte …N×8bit 2byte >=10ms
Message Content
*1) Address Set up the address for the to-be delivered message; 0 for invalid.
*2) Function code H03
*3) Starting address Set up the address of the register for reading the message.
*4) Number of register Set up the number of register for reading. Maximum number: 20.
*5) Amount of data to be read Twice the amount of *4)
*6) Data to-be read Set the data for *4); the data will be read according to the descending sequence
2. Data write-in (H06)
Mode Start Address*1) Function*2) Start Address*3) Write-in data*4) Check Stop
ASCII H3A 2char 2char 4char 4char 2char 0D 0A
RTU >=10ms 8bit 8bit 2byte 2byte 2byte >=10ms
Regular response