> 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/fp-as310-r-english-v5/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 (Hex)      | The two bytes that actually appear in the communication frame. Use this for building frames directly, or for 0-based masters (e.g. CODESYS, pymodbus). |
| 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.                                                                                              |
| Decimal                     | The decimal value of the protocol address. For 1-based debug software (e.g. Modbus Poll, Modscan), add 1 to this value.                                |
| Master Address (Convention) | The value to enter directly into PLC/HMI configuration screens — Siemens S7-200 SMART / S7-1200, Delta, Weintek, etc.                                  |

## **Read-Only Memory List**

| Register Address | Decimal | Master Address | Register length | Memory content          | Data type | Remarks                      |
| ---------------- | ------- | -------------- | --------------- | ----------------------- | --------- | ---------------------------- |
| 0x0000           | 0       | 30001          | 2               | Flowrate                | float     |                              |
| 0x0004           | 4       | 30005          | 2               | Total                   | float     |                              |
| 0x0006           | 6       | 30007          | 2               | Flowratex100            | int 32    | ×100                         |
| 0x000A           | 10      | 30011          | 2               | Totalx100               | int 32    | ×100                         |
| 0x000E           | 14      | 30015          | 1               | error code a            | int       | See Alarm A definition       |
| 0x000F           | 15      | 30016          | 1               | error code b            | int       | See Alarm B definition       |
| 0x0010           | 16      | 30017          | 1               | error code c            | int       | See Alarm C definition       |
| 0x0011           | 17      | 30018          | 1               | error code d            | int       | See Alarm D definition       |
| 0x0012           | 18      | 30019          | 1               | System Status           | int       | See System Status definition |
| 0x0013           | 19      | 30020          | 4               | Total(64)               | int 64    | ×100,000 rounded to integer  |
| 0x0017           | 23      | 30024          | 2               | Dosing(float)           | float     |                              |
| 0x0019           | 25      | 30026          | 2               | Dosing×100 (32-bit)     | int 32    | ×100 rounded                 |
| 0x001B           | 27      | 30028          | 4               | Dosing(64-bit)          | int 64    | ×100,000 rounded             |
| 0x0053           | 83      | 30084          | 1               | M (max. magnetic field) | int       |                              |
| 0x0054           | 84      | 30085          | 1               | m (min. magnetic field) | int       |                              |
| 0x0055           | 85      | 30086          | 2               | flow×100\_2             | int 32    |                              |
| 0x0057           | 87      | 30088          | 2               | na                      | -         |                              |
| 0x0059           | 89      | 30090          | 2               | totalx100\_2            | int32     |                              |


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