CTT2 services
The following tables show the codes of the CTT2 services.
Read Request/Response
CTT2 protocol | Description | ||
|---|---|---|---|
Name | Code | Additional | |
Read | 0x10 | + 2 bytes for index and length | Index 0x00 Request message with request to read the device ID |
Index 0x03 Request message with a request for read access to the inverter parameter data that was previously requested via the CTT2 Write Request/Response service with attached SPA message. | |||
Read | 0x50 | Index 0x00 + 6 bytes for the requested device ID | Response message for successful read access. The following device information is contained in the 6 additional data bytes: Vendor ID, Device ID, Outputs/Inputs, FW version. |
Index 0x03 + 12 bytes for SPA message | Response message for successful read access. The inverter parameter data is contained in the 12 additional data bytes of the SPA message. | ||
Read Error | 0x90 | + 1 byte for error code | Error Response message for faulty read access. For information regarding error causes and measures for fault elimination, refer to chapter CTT2 service errors in Error Response messages. |
Examples of the CTT2 Read Request/Response service can be found in chapter Examples for CTT2 Write Request/Response and Read Request/Response services and chapter Example for CTT2 Read Request/Response service – Determining the device ID.
Write Request/Response
CTT2 protocol | Description | ||
|---|---|---|---|
Name | Code | Additional | |
Write | 0x11 | + 2 bytes for index and length + 12 bytes for SPA message | Request message with a request for write access to the inverter parameter data. Only Index 0x03 is permitted for the SPA message. |
Write | 0x51 | No additional data bytes | Response message for successful write access. |
Write Error | 0x91 | + 1 byte for error code | Error Response message for faulty write access. For information regarding error causes and measures for fault elimination, refer to chapter CTT2 service errors in Error Response messages. |
Examples of the CTT2 Write Request/Response service can be found in chapter Examples for CTT2 Write Request/Response and Read Request/Response services.
Data Exchange Request/Response
CTT2 protocol | Description | ||
|---|---|---|---|
Name | Code | Additional | |
Data Exchange | 0x1D | + 3 bytes for index and read length, write length + 12 bytes for SPA message | Request message with a request for acyclic data exchange of an inverter parameter via an SPA message (read access or write access). Only Index 0x03 is permitted for the SPA message. |
Data Exchange | 0x5D | + 12 bytes for SPA message | Response message for successful data exchange. The inverter parameter data is contained in the 12 additional data bytes of the SPA message. |
Data Exchange Error Response | 0x9D | + 1 byte for error code | Error Response message for faulty data exchange. For information regarding error causes and measures for fault elimination, refer to chapter CTT2 service errors in Error Response messages. |
Examples of the CTT2 Data Exchange Request/Response service can be found in chapter Examples of the CTT2 Data Exchange Request/Response service.
