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Electools EDM-TH100 Modbus register map

RS485 temperature and humidity monitor, Modbus RTU

  • Official
  • 13 registers
  • Modbus RTU
  • Revision 2 · 2026-11-04
  • Identity: serial number

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.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first default
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
5 holding registers, 8 input registers
Groups
3
Translation tables
2
Revision
2 · 2026-11-04
Added
()
File
maps/electools/edm-th100.mbmap.json · 5 KB · history
SHA-256
77d60c399260f6cd8d97b14837ef56de3e7c24540fc8b874ac44290c8f25fe66
Manufacturer
electools.com.br

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Serial number Serial number input 204 uint16

Sources and notes

Source: EDM-TH100 wiki, 3.1 Especificações Técnicas and 3.2 Mapa Registradores Modbus (https://wiki.electools.com.br/books/edm-th100)

  • Function codes 0x03, 0x04, 0x06 and 0x10. Measurements and device information are input registers (FC04); the settings are holding registers (FC03 read, FC06 or FC10 write).
  • The addresses are the ones the wiki prints (001, 002, 200 to 205, 257 to 261). The wiki does not say whether they are sent as they are or minus one: test with the temperature at address 1.
  • Serial settings are the factory defaults of the wiki's table: baud rate 0 (9600) and serial configuration 2 (8E1), so even parity with 1 stop bit.
  • The wiki lists the corrections (260, 261) as unsigned 16-bit with a range of -100 to 100, while its specifications give -10 to +10. They are read here as signed 16-bit, in the unit of the specifications; the encoding (whole units or tenths) is not stated, so check before writing them.
  • The wiki puts the humidity correction at 260 and the temperature correction at 261.
  • The uptime (205) is a 32-bit value; its word order is not stated, the default (big) is used.
  • The encoding of the product code, the hardware version and the firmware version is not stated, so none of them has an identity role.
  • Written from the manufacturer's wiki; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
IR 1 uint16 R °C ×0.1 Unsigned 16-bit value in tenths of a degree (range 0 to 60 °C)
IR 2 uint16 R %RH ×0.1 Unsigned 16-bit value in tenths of a percent
IR 200 uint16 R % Communication quality index
IR 201 uint16 R
IR 202 uint16 R
IR 203 uint16 R
IR 204 uint16 R
IR 205 uint32 ABCD R s Time since the device was powered on
HR 257 uint16 RW Modbus slave address, default 1
HR 258 uint16 RW Default 0 (9600)
HR 259 uint16 RW Default 2 (8E1)
HR 260 int16 RW %RH Range -10 to +10 %RH in the specifications; the wiki's table says -100 to 100, see the notes
HR 261 int16 RW °C Range -10 to +10 °C in the specifications; the wiki's table says -100 to 100, see the notes

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