4-2 Function Mode •Pre-set numbers ranging from 1 to 32 in each Inverter (slave). (Only the Inverter having the same slave address as the query takes in the query.) •Broadcasting can be performed by setting the slave address to "0". •Data call or loopback cannot be performed while broadcasting. •Sends the function command. •The 3G3MX Series corresponds with the following data formats used in the ModBus. 4 •Specifies a function for the Inverter to perform. •Below are the function codes available to the 3G3MX Series. Functions Function code •CRC (Cyclic Redundancy Check) is used for the Modbus-RTU error check.
•The CRC code is 16-bit data generated for the block of random length data in the 8-bit unit. •To prepare the CRC code, use a generation polynomial of CRC-16 (X16 + X15 + X2 + 1).
4-67 Data name Description Coil Binary data (1-bit long) that can be referred to or changed Holding register 16-bit long data that can be referred to or changed Function code Function Maximum number of data bytes in 1 message Maximum data number in 1 message 01h Reading coil status 4 32 coils (in bits) 03h Reading holding register content 8 4 registers (in bytes) 05h Writing into the coil 2 1 coil (in bits) 06h Writing into the holding register 2 1 register (in bytes) 08h Loopback test - 0Fh Writing into multiple coils 4 32 coils (in bits) 10h Writing into multiple registers 8 4 registers (in bytes)