In the 3G3RX-V1 Series Inverter, the Write to Multiple Coils function of Modbus communication
was changed to use the same byte order as that of the 3G3MX2 Series when transferring data
over 1 byte. In addition, due to the specifications of Modbus communication, the inverter cannot
process any odd number of bytes.
If the data to be written has an odd number of bytes, add 1 byte of padding data.
Send data in the data layout for an even number of bytes as shown below, according to the
number of data bytes to be written.
• Data sent as 1-byte data (1 to 8 coils)
• Data sent as 2-byte data (9 to 16 coils)
• Data sent as 3-byte data (17 to 24 coils)
• Data sent as 4-byte data (25 to 32 coils)
Note, however, that this Inverter does not send data of 2 bytes or more because it can write to
coil numbers 0001 hex to 000E hex.
Example
To change the status of multi-function input terminals S1 to S6 of the inverter with slave address 5.
Change the ON/OFF status of the multi-function input terminal as shown in the following table.
Write to Multiple Coils [0F hex]
Coil 8 to Coil 1 (Padding data)
Coil 8 to Coil 1 Coil 16 to Coil 9
Coil 8 to Coil 1 Coil 16 to Coil 9 Coil 24 to Coil 17 (Padding data)
Coil 8 to Coil 1 Coil 16 to Coil 9 Coil 24 to Coil 17 Coil 32 to Coil 25
Item Data
Multi-function input terminal S1 S2 S3 S4 S5 S6
Coil number 0007 hex 0008 hex 0009 hex 000A hex 000B hex 000C hex
Terminal status ON ON ON OFF ON OFF
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