Delta DVP-SS2 User Manual

DVP-ES2/EX2/EC5/SS2/SA2/SX2/SE&TP Operation Manual - Programming
4-8
PLC→PC
“ 01 03 10 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 72 98”
Feedback message:
Field Name
Example (Hex)
START
No data input
≥
10 ms
Slave Address
01
Command code
03
Bytes Count
10
Data Hi (T20)
00
Data Lo (T20)
01
Data Hi (T21)
00
Data Lo (T21)
02
Data Hi (T22)
00
Data Lo (T22)
03
Data Hi (T23)
00
Data Lo (T23)
04
Data Hi (T24)
00
Data Lo (T24)
05
Data Hi (T25)
00
Data Lo (T25)
06
Data Hi (T26)
00
Data Lo (T26)
07
Data Hi (T27)
00
Data Lo (T27)
08
CRC CHK Low
72
CRC CHK High
98
END
No data input
≥
10 ms
4.3.3 CRC CHK (check sum)
The CRC Check starts from “Slave Address” and ends in “The last data content.” Calculation of CRC:
Step 1: Set the 16-bit register (CRC register) = FFFFH.
Step 2: Operate XOR on the first 8-bit message (Address) and the lower 8 bits of CRC register. Store
the result in the CRC register
Step 3: Right shift CRC register for a bit and fill “0” into the highest bit.
Step 4: Check the lowest bit (bit 0) of the shifted value. If bit 0 is 0, fill in the new value obtained at step
3 to CRC register; if bit 0 is NOT 0, operate XOR on A001H and the shifted value and store the result in
the CRC register.
Step 5: Repeat step 3 – 4 to finish all operation on all the 8 bits.
Step 6: Repeat step 2 – 5 until the operation of all the messages are completed. The final value

Delta DVP-SS2 Specifications

General

Brand	Delta
Model	DVP-SS2
Category	Controller
Language	English