> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-lt-english-v1/communication/modbus-rtu-protocol/read-only-memory-rom/read-only-memory-rom-list.md).

# Read-Only Memory (ROM) – List

## Read-Only Memory (ROM) – List

### Memory Location and Definition

| **Field Names**  | **Functions**                                                             |
| ---------------- | ------------------------------------------------------------------------- |
| Register Address | The addresses for read/write memory are not shared with read-only memory. |
| Register Length  | The length of the variable, in units of Registers (2 bytes each).         |
| Memory Content   | Description of the function or purpose of the memory.                     |
| Data Type        | Specifies the format of the transmitted or received data.                 |

## **Read-Only Memory List**

| Register Address | Register Length | Memory Content          | Data Type       | Remarks                                              |
| ---------------: | --------------: | ----------------------- | --------------- | ---------------------------------------------------- |
|             0000 |               2 | Instantaneous Flow      | float 32        |                                                      |
|             0002 |               2 | Instantaneous Flow Rate | float 32        |                                                      |
|             0004 |               2 | Totalized Flow          | float 32        |                                                      |
|             0006 |               2 | Instantaneous Flow      | int 32          | Value is instantaneous flow ×100                     |
|             0008 |               2 | Instantaneous Flow Rate | int 32          | Value is instantaneous flow ×100                     |
|             000A |               2 | Totalized Flow          | int 32          | Value is instantaneous flow ×100                     |
|             000C |               2 | Iout Current Value (μA) | unsigned int 32 |                                                      |
|             000E |               1 | error code a            | unsigned int 16 | First byte undefined, set to 0                       |
|             000F |               1 | error code b            | unsigned int 16 | First byte undefined, set to 0                       |
|             0010 |               1 | error code c            | unsigned int 16 | First byte undefined, set to 0                       |
|             0011 |               1 | error code d            | unsigned int 16 | First byte undefined, set to 0                       |
|             0012 |               1 | System Status           | unsigned int 16 | First byte undefined, set to 0                       |
|             0013 |               4 | Totalized Flow          | int 64          | Value is totalized flow ×100,000, rounded to integer |
|             0017 |               2 | Dosing                  | float32         |                                                      |
|             0019 |               2 | Dosing                  | int32           | Value is totalized flow ×100, rounded to integer     |
|             001B |               4 | Dosing                  | int64           | Value is totalized flow ×100,000, rounded to integer |


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