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Network Protocol Reference Section B-3
B-3 Network Protocol Reference
B-3-1 Transmission procedure
The transmission between the external control equipment and the inverter
takes the procedure below.
• Query - A frame sent from the external control equipment to the inverter
• Response - A frame returned from inverter to the external control equip-
ment
The inverter returns the response only after the inverter receives a query from
the external control equipment and does not output the response positively.
Each frame is formatted (with commands) as follows:
B-3-2 Message Configuration: Query
Slave address:
• This is a number of 1 to 32 assigned to each inverter (slave). (Only the
inverter having the address given as a slave address in the query can
receive the query.)
• When slave address "0" is specified, the query can be addressed to all
inverters simultaneously. (Broadcasting)
• In broadcasting, you cannot call and loop back data.
• Slave Address 1-247 in Modbus specification. When master address the
slave 250-254, broadcast toward specific slave address. Slave doesn't
answer back. And this function is valid for the write command (05h, 06h,
0Fh, 10h)
Frame Format
Header (silent interval)
Slave address
Function code
Data
Error check
Trailer (silent interval)
Slave address Broadcast to
250 (FAh) Broadcast to Slave address 01 to 09
251 (FBh) Broadcast to Slave address 10 to 19
252 (FCh) Broadcast to Slave address 20 to 29
253 (FDh) Broadcast to Slave address 30 to 39
254 (FEh) Broadcast to Slave address 40 to 247
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