G4 Multi Channel Weighing Instrument. PM/DT/HE Technical Manual

Technical ManualThe first 32 bytes of data from the instrument to the fieldbus are mandatory.Bytes 0 and 1:Contains the actual instrument error information (the value 0 means no error).See section ‘6. Communication – Modbus protocol – Instrument error’.Bytes 2 and 3:The actual status information for the instrument,see section ‘6. Communication – Modbus protocol – Instrument status’.Byte 4:The ‘Command acknowledge’. It will be equal to the command number ifthe command was successfully executed. If the command failed byte 4 will havethe value 240 (hex F0).Byte 5:The possible ‘Command error’ code. The error code is explained in section‘7. Troubleshooting – Error codes’. This byte will be zero if a command is correctlyexecuted.Bytes 6 and 7:These two bytes is the starting address of the reading area following in bytes 8 to 31.The address defines the first of the 12 consecutive modbus registers in the read area.See section ‘6. Communication – Modbus protocol’ for details on modbus registeraddress definitions.Bytes 8 to 31:These 24 bytes is the area used when the user wants to read any data that isaccessible through modbus registers. The address (number) of the first register isdefined in bytes 6 and 7 and the instrument will keep the 24 bytes (12 registers)updated.6-32