Kohler M340 Modbus register map
- Official
- 50 registers
- Revision 3 · 2026-11-10
Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.
Communication
- Protocol
- Modbus TCP and RTUdefault
- Unit ID
- 1default
- TCP port
- 502default
- Serial
- 9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
- Byte / word order
- CDAB · bytes big-endian, words low first (word swap)
- Addresses
- 0-based
- Max read
- 50 registers per request
Connection values are defaults: the device may be configured differently.
Map
- Registers
- 50 holding registers
- Revision
- 3 · 2026-11-10
- Added
- ()
- File
- maps/kohler/m340.mbmap.json · 7 KB · history
- SHA-256
- 150bbd29792a19bff49489cce932d6a3e8ac5e3dc856ad16b34d86f21b366796
- Manufacturer
- rehlko.com
Sources and notes
- Protocol Operation: Modbus Communications Protocol (TP-6113) · version 12/21, 2021-12 section 8; register tables also compared with edition 9/14
Source: Kohler, "Protocol Operation: Modbus Communications Protocol", TP-6113 12/21; https://techcomm.kohler.com/techcomm/pdf/tp6113.pdf
- M340 / M340+ automatic transfer switch controller (through the Modbus/KBUS converter).
- Baud rate must be 9600 to match the KBUS side of the converter.
- Addresses are zero-based: the manual register 40001 is address 0.
- The manual limits a read to 50 registers. Only the monitoring part of the register table is in this map.
- Data is available over Modbus RTU (8N1); Modbus TCP needs a Modbus/Ethernet converter.
| Area | Address | Name | Type | Access | Unit | Scale | Description |
|---|---|---|---|---|---|---|---|
| HR | 1 | uint16 | R | ||||
| HR | 2 | uint16 | R | ||||
| HR | 3 | uint16 | R | ||||
| HR | 4 | uint16 | R | ||||
| HR | 5 | uint16 | R | ||||
| HR | 6 | uint16 | R | ||||
| HR | 7 | uint16 | R | h | |||
| HR | 14 | uint16 | R | h | |||
| HR | 15 | uint16 | R | h | |||
| HR | 16 | uint16 | R | d | |||
| HR | 17 | uint16 | R | ||||
| HR | 18 | uint16 | R | ||||
| HR | 19 | uint16 | R | ||||
| HR | 20 | uint16 | R | ||||
| HR | 21 | uint16 | R | V | |||
| HR | 22 | uint16 | R | V | |||
| HR | 23 | uint16 | R | V | |||
| HR | 24 | uint16 | R | Hz | |||
| HR | 25 | uint16 | R | V | |||
| HR | 26 | uint16 | R | V | |||
| HR | 27 | uint16 | R | V | |||
| HR | 28 | uint16 | R | Hz | |||
| HR | 29 | uint16 | R | ||||
| HR | 30 | uint16 | R | ||||
| HR | 31 | uint16 | R | ||||
| HR | 32 | uint16 | R | ||||
| HR | 33 | uint16 | R | ||||
| HR | 34 | uint16 | R | ||||
| HR | 35 | uint16 | R | ||||
| HR | 36 | uint16 | R | ||||
| HR | 37 | uint16 | R | ||||
| HR | 38 | uint16 | R | ||||
| HR | 39 | uint16 | R | ||||
| HR | 40 | uint16 | R | ||||
| HR | 41 | uint16 | R | ||||
| HR | 42 | uint16 | R | ||||
| HR | 43 | uint16 | R | ||||
| HR | 44 | uint16 | R | ||||
| HR | 45 | uint16 | R | ||||
| HR | 46 | uint16 | R | ||||
| HR | 47 | uint16 | R | ||||
| HR | 48 | uint16 | R | ||||
| HR | 49 | uint16 | R | ||||
| HR | 50 | uint16 | R | ||||
| HR | 51 | uint16 | R | ||||
| HR | 77 | uint16 | R | s | |||
| HR | 78 | uint16 | R | s | |||
| HR | 79 | uint16 | R | ||||
| HR | 80 | uint16 | R | ||||
| HR | 81 | uint16 | R |
No registers match
Try part of the name, an address (decimal or 0x hex) or clear the filters.
Help improve this map
- I tested it on a deviceReport whether it worked, even if you did not write the map.
- Suggest a correctionEdit the file on GitHub; it opens a pull request.
- Report a problemA wrong address, type, scale or byte order.
- Read the formatWhat each key of the file means (SPEC.md).