Query Response
Query data Response data
Error check (CRC-16) Error check (CRC-16)
Slave Address
A slave address is a serial number from 1 to 247 set in advance for each inverter (slave). (Only the
inverter that matches the slave address specified in the query will capture that query.)
Simultaneous broadcast to up to five groups
Set the slave address to 0 to perform broadcasting (simultaneous broadcast).
In a broadcast, all slaves receive data, but they return no response to it.
Moreover, during a broadcast, this inverter cannot perform data read or loop-back operation.
Although the Modbus specifications define the slave addresses between 1 to 247, using the slave
addresses 250 to 254 on the master side enables you to perform simultaneous broadcasting by
group. (In this case, the slaves return no response.)
Please note that this function is enabled for write commands (function code: 05 hex, 06 hex, 0F
hex, and 10 hex) only.
Slave address Recipient
250 (FAh) Simultaneous broadcast to slave addresses 01 to 09
251 (FBh) Simultaneous broadcast to slave addresses 10 to 19
252 (FCh) Simultaneous broadcast to slave addresses 20 to 29
253 (FDh) Simultaneous broadcast to slave addresses 30 to 39
254 (FEh) Simultaneous broadcast to slave addresses 40 to 247
Function Code
A function code specifies the function to be performed by the target inverter(s).
The supported function codes are as shown in the table below
.
Function code
Function
code
Function
Maximum number of
data bytes per mes-
sage
Maximum number of data per
message
01 hex Read Coil Status 10 80 coils (in bits)
03 hex Read from Holding Register 200 100 registers (in bytes)
05 hex Write to Coil 2 1 coil (in bits)
06 hex Write to Holding Register 2 1 register (in bytes)
08 hex Loop-back Test - -
0F hex Write to Multiple Coils 2 16 coils (in bits)
10 hex
Write to Multiple Holding Regis-
ters
200 100 registers (in bytes)
17 hex
Read/Write from/to Multiple
Holding Registers
32 each for read/write
operation
16 registers each for read/write
operation (in bytes)
8 Communications Functions
8-8
M1 Series Standard Type User's Manual (I669)
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