RTU mode
:
START
Maintaining no input signal for more than or equal to 10ms
Address
address：8-bit Binary address
Function
Function code：8-bit Binary address
DATA
（
n - 1
）
Data content：
N*8-bit data，N<=8，less than 8 bytes
……………
DATA 0
CRC CHK Low
CRC Check code
CRC CHK High 16-bit CRC check code is combined with 2 8-bit Binary code
END
Maintaining no input signal for more than or equal to 10ms
Address
:
00H
：
All broadcast from VFDs
01H
：
Communication with VFD of 01 address
0FH
：
Communication with VFD of 15 address
10H
：
Communication with VFD of 15 address, and so on, maximum to 254
（
FEH
）。
Function and DATA code:
03H
：
Read data from a register
06H
：
Write data to the register.
08H
：
Loop detection.
Function code 03H
：
Read data from a register
：
For example
：
read data from the address 2104H of register (Output current)
ASCII
mode
:
Asking for information string format
Answering information string format
Header
“：”---
3AH
Header
“：”---
3AH
Address
“
0”---30H
Address
“0”---30H
“1”---31H
“1”---31H
Function code
“
0”---30H
Function code
“0”---30H
“3”---33H
“3”---33H
Larson Electronics, LLC
Phone:
Fax: (903) 498-3364
www.larsonelectronics.com
45
of
52
VFD-1P-220.240-1HP-7A-DCM
(877) 348-9680