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The AC drive will return a character string, the format of which will be as follows:
"Q,S,B,UU,NN,ABCD"
AC MOTOR DRIVE TO COMPUTE
COMMAND STRUCTURE
Word length = 11 characters
Q: Header of question string
S: Check sum (03H)
B: Acknowledge back
Correct: 06H
Error: 07H
UU: Slave address (“00” - “31”)
NN: 00 Frequency command = ABC.D (Hz)
01 Output frequency = ABC.D (Hz)
02 Output current = ABC.D (Amp)
03 Operation command, Drive status & Error code
ABCD: When NN = 00, ABC.D (Hz)
When NN = 01, ABC.D (Hz)
When NN = 02, ABC.D (Amp)
When NN = 03, A: Operation command
0: Stop
1: Forward operation
2: Stop
3: Reverse operation
4: Forward jog
5: Forward jog
6: Reverse jog
7: Reverse jog
8: Reset after AC drive error
B: AC drive status
“” = Binary code bit map
bit 0: 0 = Stop 1 = Run
bit 1: 0 = Forward 1 = Reverse
bit 2:
0 = Non-DC
braking start
1 = DC braking
start
bit 3:
0 = Non-DC
braking stop
1 = DC braking
stop
bit no.
7 6 5 4 Frequency reference source
0 0 0 0 Keypad control
0 0 0 1 Multi-step speed command 1
0 0 1 0 Multi-step speed command 2
0 0 1 1 Multi-step speed command 3
0 1 0 0 Multi-step speed command 4
0 1 0 1 Multi-step speed command 5
0 1 1 0 Multi-step speed command 6
0 1 1 1 Multi-step speed command 7
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