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4-163

4-4 Communication Function

Functions

BCC (Block Check Code) Calculation Method

(Example) To set "5 Hz" using command 01 (frequency reference setting) (When the target station

No. is "01")

To determine BCC, the Inverter performs ASCII conversion from the station No. to data, and calcu-

lates a result of the exclusive OR (Xor) per byte.

For the above transmission frame, BCC is calculated as follows:

(Appendix) ASCII Code Conversion Table

Text data ASCII code Text data ASCII code

STX 2 A 41

ACK 6 B 42

CR 0D C 43

NAK 15 D 44

030 E45

131 F46

232 H48

333 P50

434 b62

535

636

737

8 38

939

Transmission Frame Structure

STX Station No. Command Data BCC CR

ASCII code

(0x 02)

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

05 ......This value is BCC.

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