Modbus Protocol Reference
The following section describes the protocol profile of Modbus.
| Module | Address Range | Description |
|---|---|---|
| Master Info | D0000 - D0021 | Master-only identifiers, firmware, time, protocol version, comm status. |
| Module A - Channel Info | D0022 - D0725 | Per-channel info block. |
| Module B - Indoor Unit Parameters | D24000 - D34239 | Per-indoor-unit parameter block . |
| Module C - Group Control (per-Ch) | D23581 - D23652 | Per-channel single-channel group control block. |
| Module D - Group Control (All-Ch) | D23885 - D23892 | All-channel group control. |
| System Settings | D65000 - D65005 | Time set & device reboot. |
Address-Arithmetic Rules
X: Channel ID, U: Indoor Unit ID
Module A: Channel X (1-4): D(22 + (X-1) * 176 +field_offset)
Module B: Channel X (1-4), Unit U (1-160): D(24000 + (X-1) * 2560 + (U-1) * 16 + field_offset)
Module C: Channel X (1-4): D(23581 + (X-1) * 18 + field_offset)
All offsets are in register units: H = B15-B8 (high byte), L = B7-B0 (low byte).