# Function Codes

Following Function Codes are available on the IS4310 (Modbus Slave):

* 0x03 - Read Holding Registers
* 0x06 - Write Sigle Register
* 0x10 - Write Multiple Registers

If the PLC (Modbus Master) attempts to execute a query with a Function Code not listed above, the IS4310 (Modbus Slave) will respond with Exception Code 1.