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WB-M1W2 v.3 Modbus register map

revision 107848

Description

Legend
RO / RW Read only / Read/Write
Shown in bold Default register value
xN Multiply the register value by this factor to obtain the value in the stated units.

If omitted, assume 1

⚡ This register supports data transmission using events in Fast Modbus.
FW Firmware version that introduced the register. Blank means it has always been available.
Error: Value on error
Grey cell Service register: purpose, format and contents may change in later firmware
Device Modbus registers
Address Register parameters Channel Description Values FW
Dec Hex Type Access Format
Input operating modes
275 0x0113 Holding RW u16 Input 1 Input mode 0 — 1-wire,
1 — digital input: counting and press detection 		≥ 4.0.0
276 0x0114 Input 2
1-Wire sensors
24 0x0018 Coil RW bool Input 1 Save newly detected sensors 1 — save new sensors ≥ 4.35.0
25 0x0019 Input 2
32 0x0020 Coil RW bool Save newly detected sensors on all inputs 1 — save new sensors ≥ 4.35.0
16 0x0010 Discrete input RO bool Input 1 Sensor polling status on the input.
The sensor is polled without assignment by ID; this register is valid only with one sensor on the input 		0 — sensor missing or polling errors,
1 — sensor connected and polled successfully 		≥ 4.6.0
17 0x0011 Input 2
128 - 147 0x0080 - 0x0093 Discrete input RO bool Input 1 Polling status of sensor 1–20.
The sensor whose ID is stored in the corresponding assignment slot is polled (see Sensor ID 1–20 registers) 		0 — empty slot, sensor not found on bus, or polling errors,
1 — sensor connected and polled successfully 		≥ 4.35.0
168 - 187 0x00A8 - 0x00BB Input 2
7 0x0007 Input RO s16 Input 1 DS18B20 sensor temperature.
Valid only with one sensor on the input. Includes the correction assigned to the first slot 		x0.0625, °C
Error: 0x7FFF
8 0x0008 Input 2
20 0x0014 Input RO s16 Input 1 Last valid DS18B20 temperature reading.
Valid only with one sensor on the input. Includes the correction assigned to the first slot 		x0.0625, °C ≥ 4.6.0
21 0x0015 Input 2
99 0x0063 Holding RW u16 DS18B20 erroneous-value filter.
A reading of 85 °C is rejected if it differs from the previous reading by more than the filter threshold. 		x0.0625, °C
0 — filter disabled,
1…19200 (32) 		≥ 3.10.0
101 0x0065 Holding RW u16 Temperature sensor polling interval. When changing this parameter, also change the coefficient in register 99. s,
1 - 60 (2) 		≥ 4.33.1
376 0x0178 Input RO u8 Input 1 1-Wire sensor present 0 or 1 ≥ 4.24.0
377 0x0179 Input 2
448 0x01C0 Input RO u8 Input 1 DS18B20 power status.
May work incorrectly with some clone sensors 		1 — all sensors externally powered,
0 — at least one sensor uses parasitic power 		≥ 4.32.0
449 0x01C1 Input 2
456 0x01C8 Input RO u16 Input 1 Line-busy error counter ≥ 4.32.3
457 0x01C9 Input 2
1536 - 1555 0x0600 - 0x0613 Input RO s16 Input 1 Sensor 1–20 temperature including correction x0.0625, °C
Error: 0x7FFF 		≥ 4.35.0
1576 - 1595 0x0628 - 0x063B Input 2
1616 - 1635 0x0650 - 0x0663 Holding RW s16 Input 1 Sensor 1–20 temperature correction.
Added to the sensor reading. Assigned to the slot, not the sensor ID: replacing the sensor in a slot retains the correction 		x0.0625, °C
−160 to 160 (0), equivalent to ±10 °C 		≥ 4.36.0
1656 - 1675 0x0678 - 0x068B Input 2
1696 - 1715 0x06A0 - 0x06B3 Input RO s16 Input 1 Sensor 1–20 temperature without correction x0.0625, °C
Error: 0x7FFF 		≥ 4.36.0
1736 - 1755 0x06C8 - 0x06DB Input 2
3328 0x0D00 Input RO u8 Input 1 Number of newly detected sensors ≥ 4.35.0
3329 0x0D01 Input 2
3336 0x0D08 Input RO u8 Input 1 Number of newly saved sensors ≥ 4.35.0
3337 0x0D09 Input 2
3344 0x0D10 Input RO u8 Input 1 Number of detected sensors ≥ 4.35.0
3345 0x0D11 Input 2
3584 - 3603 0x0E00 - 0x0E13 Input RO s16 Input 1 Last valid temperature of sensor 1–20 including correction x0.0625, °C ≥ 4.35.0
3624 - 3643 0x0E28 - 0x0E3B Input 2
3680 - 3759 0x0E60 - 0x0EAF Input RO u64 Input 1 ID of newly detected sensor 1–20 (4 registers per sensor) byte 0 — family code,
bytes 1–6 — serial number,
byte 7 — reserved (0)

0 — sensor absent 		≥ 4.35.0
3840 - 3919 0x0F00 - 0x0F4F Input 2
4352 - 4431 0x1100 - 0x114F Input RO u64 Input 1 ID of detected sensor 1–20 (4 registers per sensor) byte 0 — family code,
bytes 1–6 — serial number,
byte 7 — reserved (0)

0 — sensor absent 		≥ 4.35.0
4512 - 4591 0x11A0 - 0x11EF Input 2
5632 - 5711 0x1600 - 0x164F Holding RW u64 Input 1 Sensor ID 1–20 — input assignment slot (4 registers per sensor) byte 0 — family code,
bytes 1–6 — serial number,
byte 7 — reserved (0)

0 — sensor unused 		≥ 4.35.0
5792 - 5871 0x16A0 - 0x16EF Input 2
Counting and press detection
0 0x0000 Discrete input ⚡ RO bool Input 1 Input state 0 — open or 1-Wire mode selected,
1 — closed 		≥ 4.0.0
1 0x0001 Input 2
100 0x0064 Holding RW u16 Reset input activation counters 1 — reset counters ≥ 4.33.0
277 0x0115 Input ⚡ RO u16 Input 1 Input activation counter ≥ 4.0.0
278 0x0116 Input 2
340 0x0154 Holding RW u16 Input 1 Input debounce time ms,
0…100 (50) 		≥ 4.32.0
341 0x0155 Input 2
464 0x01D0 Input ⚡ RO u16 Input 1 Short-press counter
465 0x01D1 Input 2
480 0x01E0 Input ⚡ RO u16 Input 1 Long-press counter
481 0x01E1 Input 2
496 0x01F0 Input ⚡ RO u16 Input 1 Double-press counter
497 0x01F1 Input 2
512 0x0200 Input ⚡ RO u16 Input 1 Short-then-long-press counter
513 0x0201 Input 2
1100 0x044C Holding RW u16 Input 1 Long press time ms,
500…5000 (1000)
1101 0x044D Input 2
1140 0x0474 Holding RW u16 Input 1 Second press waiting time ms,
0…2000 (300)
1141 0x0475 Input 2
Connection settings, firmware version and other service registers
Address Register parameters Description Values Note
Dec Hex Type Access Format
Connection settings
110 0x006E Holding RW u16 RS-485 baud rate.
RS-485 connection parameter settings 		×100, baud
12 — 1200 bit/s,
24 — 2400 bit/s,
48 — 4800 bit/s,
96 — 9600 bit/s,
192 — 19200 bit/s,
384 — 38400 bit/s,
576 — 57600 bit/s,
1152 — 115200 bit/s
111 0x006F Holding RW u16 RS-485 parity setting 0 — no parity (none),
1 — odd,
2 — even
112 0x0070 Holding RW u16 RS-485 stop bits
See: stop-bit tolerance 		1, 2
128 0x0080 Holding RW u16 Device Modbus address (details)
200-219 0x00C8 - 0x00DB Input RO string Device model
220-244 0x00DC - 0x00F4 Input RO string Firmware build commit hash and branch name (2 characters per register)
250-265 0x00FA - 0x0109 Input RO string Firmware version
266-269 0x010A - 0x010D Input RO u64 Serial number extension
270-271 0x010E - 0x010F Input RO u32 Serial number
290-301 0x0122 - 0x012D Input RO string Firmware signature
320 0x0140 Input RO u16 Firmware version in numeric format (details) MAJOR
321 0x0141 MINOR
322 0x0142 PATCH
323 0x0143 s16 SUFFIX
324-325 0x0144 - 0x0145 Input RO u32 Firmware version in numeric format
326-327 0x0146 - 0x0147 Input RO u32 Firmware version in big-endian format
Other information
104-105 0x0068 - 0x0069 Input RO u32 Uptime since boot seconds
120 0x0078 Holding RW u16 Reboot device without saving state Any non-zero value reboots the device
129 0x0081 Holding RW u16 Enter firmware update mode for 2 minutes Any non-zero value enters firmware update mode
330-337 0x014A - 0x0151 Input RO string Bootloader version
130 0x0082 Holding RW u16 Disable Status LED 0 — enabled
1 — disabled
131 0x0083 Holding RW u16 Enter firmware update mode using the current communication settings.
To check whether the firmware and bootloader support this feature, read this register. If reading succeeds and returns 0, the feature is supported. 		Writing 1 enters firmware update mode
113 0x0071 Holding RW u16 Delay before replying to a Modbus request ms
0…254 (0) 		Only in firmware supporting Fast Modbus
114 0x0072 Holding RW u16 Continuous reading across register gaps 0 — disabled
1 — enabled
2 — enabled persistently across reboots 		Only in firmware supporting Fast Modbus
121 0x0079 Input RO u16 Current supply voltage mV
122 0x007A Input RO u16 Minimum supply voltage since boot, without averaging mV
125 0x007D Input RO u16 Current supply voltage, without averaging mV
119 0x0077 Input RO u16 Minimum microcontroller supply voltage since boot, before averaging mV
123 0x007B Input RO u16 Microcontroller supply voltage mV
124 0x007C Input RO s16 Internal microcontroller temperature x0.1, °C
304-319 0x0130-0x013F Input RO string Device batch number.

Available only on devices manufactured from 21 January 2026.

65402 0xFF7A Holding RW u16 Reset device settings to defaults. Communication settings are retained.
The device reboots after the reset. 		Writing 1 resets the settings
64256-64383 0xFB00-0xFB7F Input RO u16 FlashFS: free space per page bytes
64384-64511 0xFB80-0xFBFF Input RO u16 FlashFS: total size of current files per page bytes
64512-64639 0xFC00-0xFC7F Input RO u16 FlashFS: page fragmentation 0…100 %
0 — all data is current,
100 — no current data
64640-64767 0xFC80-0xFCFF Input RO u16 FlashFS: page erase counter
65504 0xFFE0 Input RO u16 Maximum stack usage bytes
0 — stack corrupted
65505 0xFFE1 Input RO u16 Free RAM bytes
65506 0xFFE2 Input RO u16 Used RAM bytes
65507 0xFFE3 Input RO u16 Stack size bytes
65508 0xFFE4 Input RO u16 Cause of last MCU reset 1 — LPWR,
2 — WWDG,
3 — IWDG,
4 — SFT,
5 — POR,
6 — PIN,
7 — OBL,
8 — V18PWR
65509 0xFFE5 Input RO u32 Firmware update counter