Nidec Embraco CF01F - Page 31

4.2.3. Basic command structure
Transmit command
structure
1st byte
identificatio
n
2nd byte
comman
d
3rd byte
data low
4th byte
data
high
5th byte
checksu
m
1: Transmit set speed
A5h
C3h
1)
2)
3)
2: Read set speed
A5h
3Ch
80h
39h
3)
3: Read operation
status
A5h
3Ch
83h
39h
3)
Table 18 – Serial Communication – Transmit Command Structure
Receive command
structure
1st byte
identificatio
n
2nd byte
comman
d
3rd byte
data low
4th byte
data
high
5th byte
checksu
m
Response to 1
5Ah
83h
4)
5)
3)
Response to 2
5Ah
80h
1)
2)
3)
Response to 3
5Ah
83h
4)
5)
3)
Communication error
5Ah
6)
FFh
FFh
3)
Table 19 – Serial Communication – Receive Command Structure
Definition of command bytes:
1. Set speed data low byte
2. Set speed data high byte
3. Checksum:
Checksum = 100h – ((1st_byte + 2nd_byte + 3rd_byte + 4th_byte) & FFh)
4. Status data low byte
5. Status data high byte
6. Error code:
F0h - Error in byte 4
F2h - Error checksum (byte 5)
F4h - Error command Code (byte 2)
F8h - Error in byte 3
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