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3.4 Check sum
ASCII mode:
LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, the
values of the bytes from ADR1 to last data character then calculating the hexadecimal
representation of the 2's-complement negation of the sum.
For example, reading 1 word from address 0401H of the AC drive with address 01H.
01H+03H+04H+01H+00H+01H=0AH, the 2's-complement negation of 0AH is F6H.
RTU mode:
CRC (Cyclical Redundancy Check) is calculated by the following steps:
Step 1: Load a 16-bit register (called CRC register) with FFFFH.
Step 2: Exclusive OR the first 8-bit byte of the command message with the low order byte
of the 16-bit CRC register, putting the result in the CRC register.
Step 3: Examine the LSB of CRC register.
Step 4: If the LSB of CRC register is 0, shift the CRC register one bit to the right with MSB
zero filling, then repeat step 3. If the LSB of CRC register is 1, shift the CRC register one bit
to the right with MSB zero filling, Exclusive OR the CRC register with the polynomial value
A001H, then repeat step 3.
Revision May 2009, 00DE, V0.50
STX
Address 1
Address 0
Function 1
Function 0
Starting data address
Number of data
LRC Check 1
LRC Check 0
END 1
END 0
Address
Function
Starting data address
Number of data
(count by word)
CRC CHK Low
CRC CHK High
Chapter 4 Parameters| BLD-E1 Series
':'
'0'
'1'
'0'
'3'
'0'
'4'
'0'
'1'
'0'
'0'
'0'
'1'
'F'
'6'
CR
LF
01H
03H
21H
02H
00H
02H
6FH
F7H
4-87
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