8 Communications Functions
8 - 94
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
Example. To set the frequency reference to 5 Hz by using command 01 (Target station No. = 01)
To calculate BCC, convert the frame segments from Station No. to Data into ASCII code and then
perform exclusive OR (XOR) operation byte by byte.
In the case of the above transmission frame, BCC is calculated as follows.
ASCII Code Conversion Table
BCC (Block Check Code) Calculation Method
Text data ASCII code Text data ASCII code
STX 2 A 41
ACK 6 B 42
CR 0D C 43
NAK 15 D 44
030E45
131F46
232H48
333P50
434b62
535
636
737
838
939
Transmission Frame Structure
STX Station No. Command Data BCC CR
ASCII code
(0x 02)
01 (0x 30 31)
01 (0x 30 31)
000500 (0x 30 30 30 35 30 30)
05 (0x 30 35)
(0x 00)
30 31 30 31 30 30 30 35 30 30
Xor
Xor
Xor
Xor
Xor
Xor
Xor
Xor
Xor
01
31
00
30
00
30
05
35
05 ······ This value is BCC.
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