116 Appendix 3 Communication Protocol
EV2000 Series Universal Variable Speed Drive User Manual
5.4 Index Section
Meaning of Data: Auxiliary index bytes and command index bytes are included.
For the master, the auxiliary index and command index are used to cooperate with the master to accomplish concrete
functions.
For the slave, auxiliary index is used to report fault code. The command code will not be changed but reported directly.
Data type: Hex, four bytes. ASCII format.
Command code uses the lower two bytes, data range: “00”~”FF”.
Auxiliary code uses the higher two bytes, data range: “00”~”FF”.
The fault code of the slave will occupy “auxiliary index” byte, see Table A-7.
Table A-7 Type of faults
Fault Index Description of Fault Fault Index Description of Fault
01 Over current in Acc process 02 Over current in Dec process
03
Over current in constant-speed
Running process
04 Over voltage in Acc process
05 Over voltage in Dec process 06
Over voltage in constant-speed
Running process
07 Over voltage in stopping process 08 Phase failure of AC supply
09 Phase loss of drive’s AC output 10 IGBT fault
11 IGBT overheat 12 Rectifier bridge overheat
13 Drive overload 14 Motor overload
15
External equipment fault of emergent
stop
16 EEPROM fault
17 Serial communication error 18 Contactor unclosed
19 Current detection error 20 CPU error
23 Parameters copy error 24 Auto-tuning error
5.5 Checksum
Meaning of Data: Frame verification. Four bytes. ASCII.
Calculation method: To sum up the ASCII values of all the bytes from “slave address” to “operation data”.
5.6 Frame Tail
Hex OD, Single byte.
1) Command list of protocols
In the following explanation, frame head 7E, frame tail OD, address and checksum are omitted. The format is ASCII
character.
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