IDEC High Performance Series - Manual (Page 152)

5 User Communication
3-50 WindO/I-NV2 User’s Manual
• Bytes and BCC data
When the converted data is 3034h, the data appended to the transmission data is as follows.
• When Calculation Type is Modbus ASCII (LCR)
When the BCC calculation result is 4241h after Binary (HEX) to ASCII conversion the resulting two bytes of
data is appended to the transmission data.
• When Calculation Type is Modbus RTU (CRC)
When the BCC calculation result is BA30h with no conversion the two bytes of data is appended to the
transmission data.
0
(30h)
4
(34h)
1 byte
BCC data (Second byte) (First byte)
Converted data
4
(34h)
0
(30h)
4
(34h)
BCC data
0
(30h)
4
(34h)
2 bytes
Converted data
(Second byte) (First byte)
B
(42h)
A
(41h)
B
(42h)
A
(41h)
BCC data
4241h
Binary (HEX) to ASCII
Data
2 bytes
Converted data
(Second byte) (First byte)
BAh 30h BAh 30h
BA30h
No conversion
BCC data
Data
2 bytes
Converted data
(Second byte) (First byte)