GE EPM 6000 Application Layer, Following function codes are implemented on the EPM

CHAPTER 5: COMMUNICATIONS

5.3.4Application Layer

The application layer contains a header (request or response header, depending on direction) and data.

Application headers contain the application control field and the function code. For the application control field, multiple-fragment messages are not allowed for EPM 6000. Each application header should indicate it is both the first fragment (FIR = 1) as well as the final fragment (FIN = 1). Application-level confirmation is not used for the EPM 6000.

The following function codes are implemented on the EPM 6000.

•Read (function 1): Objects supporting the READ function are Binary Outputs (object 10), Counters (object 20), Analog Inputs (object 30), and Class (object 60). These Objects may be read either by requesting a specific variation available as listed in DNP Point Mapping on page 5–10, or by requesting variation 0. A READ request for variation 0 of an object will be fulfilled with the variation listed in the DNP points table.

•Write (function 2): The Internal Indications object (object 80), supports the WRITE function.

•Direct Operate (function 5): The Control Relay Output object (object 12) supports the DIRECT OPERATE function.

•Direct Operate - No Acknowledgment (function 6): the Change to Modbus RTU protocol (object 12, point 1) supports the DIRECT OPERATE - NO ACKNOWLEDGMENT function.

•Response (function 129): Application responses from the EPM 6000 use the RESPONSE function.

5–14 EPM 6000 MULTI-FUNCTION POWER METERING SYSTEM – USER GUIDE