User Manual
EM303A General Purpose Inverter
136
Frame Structure of Receiving Message
Receive Sequence Bytes Received
0 ≥Idle periods of 4 bits
1 Address code 1
2 Function code 1
3
Sub-function code
（H）
2
4
Sub-function code
（L）
5
Data
（H）
2
6
Data
（L）
7
CRC parity
（L）
2
8
CRC parity
（H）
9 ≥Idle periods of 4 bits
12.4 Description of Protocol Format
12.4.1 Address Code
Address of slave inverter. The setting range: 1~247, 0 is broadcast address.
12.4.2 Command Code
Command Code Function
03H Read parameters and status byte of inverter
06H Write single function code or control parameter of inverter
10H Write several function codes or control parameters of inverter
08H Circuit diagnosis and setting
12.4.3 Allocation of Register’s Addresses
Name Address Description
Function
Code
0000H～
1F1FH
(Saving
Address）
High byte is the function code group number.F0 ～ FF, C0, E0 is
corresponding to high bytes 00H～0FH, 10H, 11H respectively.
Low byte is serial number of function code group. 0~31 are
corresponding to low bytes 00H~1FH. For example: the corresponding
saving address of F0-07 is 0007H.
2000H～
3F1FH
（Temporary
Saving
Address）
Frequent modification of EEPROM will reduce its service lifespan. If
only editing the value of function code without temporary saving, and
then only the value of RAM need to be edited. Complete the operation by
the address of function code+2000H. For example, the temporary saving
address of F0-07 is 2007H.
Control
Command
40xx Refer to Appendix 1
Working
Status
41xx Refer to Appendix 1
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