SV-iS7 User Manual - Inverter Drive Supermarket

Chapter 11 Communication Function
11-10
� Error code: two can be displayed ASCII (20h ~ 7Fh)
� Transmission/reception buffer magnitude: transmission = 39 byte, reception = 44 byte
� Monitor registration buffer: 8 Word
� SUM: inspection by making sum to check communication errors
SUM = ASCII-HEX form of the 8 lowest bits of (Address No. + CMD + data)
E.g.) Request for reading of one of 3000 address numbers as follows
ENQ Address No. CMD Address
No.
Number of
Addresses
SUM EOT
05h “01” “R” “3000” “1” “AC” 04h
1 2 1 4 1 2 1
SUM = ‘0’ + ‘1’ + ’R’ + ‘3’ + ‘0’ + ‘0’ + ‘0’ + ‘1’
= 05h + 30h + 31h + 52h + 33h + 30h + 30h + 30h + 31h
= 1A7h (Control value excluded: ENQ, ACK, NAK, etc.)
� BroadCast Function
used to give command to all the inverters bound by the network at a time
Method: give command at Address No. 255
Action: Each inverter receives and replies to it though it’s not their own set address No.
11.2.2 Detailed reading protocol
Reading Request: Request for reading of n number of Word data consecutive from xxxx address No.
ENQ Address No. CMD
Address
No.
Number of
Addresses
SUM EOT
05h “01” ~ “1F” “R” “XXXX” “1” ~ “8” = n “XX” 04h
1 2 1 4 1 2 1
Total byte = 12, quotation marks refers to characters.
Normal Reading Response:
ACK Address No. CMD Data SUM EOT
06h “01” ~ “1F” “R” “XXXX” “XX” 04h
1 2 1 N * 4 2 1
Total byte = 7 * n * 4 = 39 at maximum
Error Reading Response:
NAK Address No. CMD Error code SUM EOT
15h “01” ~ “1F” “R” “**” “XX” 04h
1 2 1 2 2 1
Total byte = 9