Description
Bluetooth water meter 20mm (BLE System)
BLE protocol basics
- Each unit has a unique MAC address
- Meter id is last 4 bytes of the MAC address
- Units type can be identified via the unit name (NWW, NCC, NUU, and NVV)
- Advertising – the unit transmits basic data every TBT second(the default is 2 sec)
- The unit has a specific service (UUID) for programming
Parameters
Logger
180 Days Daily Logger
RTC
Test Mode
Meter Params (Gear ratios and flows)
General Params (CW, CCW, factor, units, pulse output)
Irrigation (program no, time, amount of water..)
Alerts parameters (backflow TH, Leak, Max flow..)
Irrigation Alert parameters (valve open w/o flow…)
BLE parameters (Tx interval, Pin code..)
General Parameters
| Byte No. | Field | Size (Byte) | Description | Remarks |
| 0 | Opcode | 1 | ||
| 1 | Factor | 1 | Index of factor | |
| 2 | CountUnits | 0.5 | Index of count units | |
| 2 | Flow units | 0.5 | Index of flow units | |
| 3 | PulseDigit1 | 0.5 | From factor value (0-factor value, 1- factor value x 10,…) | |
| 3 | PulseDigit2 | 0.5 | From factor value (0-factor value, 1- factor value x 10,…) | |
| 4 | PulseWidth | 2 | Pulse width in msec | |
| 6 | CountDir (lsb bit) | 0.125 | Positive flow direction(0/1) | |
| 6 | LowDisplayRefrash | 0.875 | In sec | |
| 7 | CwCount | 4 | Upper counter value | |
| 11 | CcwCount | 2 | Backflow counter value | |
| 13 | MeterStatus | 2 | Unit status | |
| 15 | DeltaMeas | 1 | Min analog value of magnet movement detection | |
| 16 | LoggerInterval | 1 | Data logger interval in minutes | |
| 17 | SoftwareVerHigh | 1 | ||
| 18 | SoftwareVerLow | 1 | ||
| 19 | HWVER | 1 |
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