3 . I n s t r u c t i o n S e t
M N050 03003E F or mo re infor ma tio n vi sit:
w w w. e a t o n . c o m
3-237
START/END:
RTU Timeout Timer:
Baud rate(bps) RTU timeout timer (ms) Baud rate (bps) RTU timeout timer (ms)
300 40 9,600 2
600 21
19,200 1
1,200 10 38,400 1
2,400 5 57,600 1
4,800 3 115,200 1
Address:
00 H: Broadcasting to all drives (Broadcast)
01 H: toward the drive at address 01
0F H: toward the drive at address 15
10 H: toward the drive at address 16
… and so on, max. address: 254 (‘FE’)
Function code:
03 H: read contents from multiple registers
06 H: write one word into single register
10 H: write contents to multiple registers
Data characters:
The data sent by the user
CRC checksum: Starting from Address and ending at Data Content. The calculation is as follows:
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 obtained in the CRC register is the CRC checksum. Care should be taken when
placing the LOW byte and HIGH byte of the obtained CRC checksum.
Содержание ELC-PB
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