Special Functions

Special reading and writing functions are Driver functions not defined by the standard Modbus protocol. They were developed to meet specific features of certain devices, or else to provide, in a standardized way by this Driver, features not available in the standard protocol. The Modbus Driver, in its current version, includes the following special functions:

Reading Functions

·65 03: Mass Memory Reading (ABB MGE 144), described in details on topic Reading Mass Memory Registers in ABB MGE 144 Meters

·GE SOE: Event Reading (GE PAC RX7 Systems), described in details on topic Reading an Event Buffer in GE PAC RX7 Controllers

·SP SOE: Event Reading (Schneider Electric SEPAM series Relays), described in details on topic Reading Events in Schneider Electric SEPAM Series 20, 40, and 80 Relays

·GenSOE: SOE reading with a generic algorithm, implemented by a resident software in the slave device (PLC), described in details on topic Elipse Software's Generic SOE Reading Algorithm

Writing Functions

·65 01: Restarts (performs a reset operations) a power meter (ABB MGE 144). This command is sent as a Tag's simple writing command (Write). Tag's Value field is ignored by this Driver and can be left in 0 (zero). For more information, please check device's manual

·65 02: Zeroes the maximum and minimum memory (ABB MGE 144). This command is sent as a Tag's simple writing command (Write). Tag's Value field is ignored by this Driver and can be left in 0 (zero). For more information, please check device's manual

Notice that this Driver's special functions, except for the writing function 65 01, are directly or indirectly related to mass memory reading of registers of their respective devices. For more information, please check topic Mass Memory Reading. For a description on how to configure operations and Tags using these functions, please check topic Configuration.