Product photograph pending
ENMG / TEMPERATURE & HUMIDITY TRANSMITTERS
EHTB100-RM
RS485 temperature and humidity transmitter
A compact environmental transmitter for control cabinets and sheltered monitoring locations, with digital temperature and humidity output over Modbus RTU.
Request a quote ↗TECHNICAL DATA / EHTB100-RM
Specifications & selection.
- 5–36 VDC supply; power below 1 W.
- Typical accuracy at 25 °C: ±0.2 °C and ±1.8% RH.
- 60 × 30 × 18 mm enclosure; 54 g; IP20.
| Parameter | Specification |
|---|---|
| Temperature measurement range | −40 to +120 °C in technical specification |
| Humidity measurement range | 0–100% RH |
| Typical accuracy at 25 °C | Temperature ±0.2 °C; humidity ±1.8% RH |
| Resolution | 0.1 °C / 0.1% RH |
| Device operating / storage temperature | −20 to +60 °C / −30 to +70 °C |
| Operating humidity | ≤95% RH, non-condensing |
| Supply / power | 5–36 VDC / <1 W typical; reverse-polarity protection stated |
| Ingress / installation | IP20 / supplied 3M adhesive pad |
| Size / mass | 60 × 30 × 18 mm / 54 g |
| Address | Purpose | Type / scaling | Access |
|---|---|---|---|
| 0x0000 | Station address | uint16; 1–247, default 1 | 0x03 read / 0x06 write |
| 0x0001 | Baud code | 0=9600, 1=4800, 2=2400; default 0 | 0x03 / 0x06 |
| 0x0002 | Temperature offset | int16 / 10 °C; ±10.0 °C, default 0 | 0x03 / 0x06 |
| 0x0003 | Humidity offset | int16 / 10% RH; ±10.0% RH, default 0 | 0x03 / 0x06 |
| 0x0004 | Temperature | int16 / 10 °C | 0x04 read |
| 0x0005 | Humidity | uint16 / 10% RH; limited to 0–100% RH | 0x04 read |
| Parameter | Value |
|---|---|
| Brown / blue | VCC+ / GND |
| White / black | RS485 A / B |
| Serial format | 8 data bits, no parity, 1 stop bit |
| Default / selectable baud | 9600 / 9600, 4800, 2400 bps |
| Read temperature and humidity, station 1 | 01 04 00 04 00 02 30 0A; includes CRC |
| Protocol behavior | Slave responds to master requests; no unsolicited reporting; 0x10 not supported |
Selection & installation notes
- The measurement range does not expand the complete-device operating range. Observe −20 to +60 °C and non-condensing conditions for installation.
- The protocol table permits temperature values up to +125 °C, while the technical measurement specification ends at +120 °C. Confirm the sensor revision before using the extended range.
- Decode negative temperature and calibration as signed 16-bit integers. The example frame includes CRC; do not append a second CRC. Recalculate CRC after changing any bytes.
- Assign unique addresses before connecting multiple units. After a baud change, verify with a read at the target rate before repeating a write; a missing reply does not prove the write failed.
- Use an appropriate RS485 bus, termination and EMC grounding scheme; keep signal wiring away from power cables. IP20 requires a protected, dry installation. The official page currently provides no usable product photograph.
Based on the official Chinese product page and selection charts ↗. Checked 2026-09-15. Confirm the current specification for the exact model when ordering.
TECHNICAL RESOURCES
Plan your integration.
ENMG cabinet environment systems — English product-family brochure.
This is a product-family brochure. Request a model-specific datasheet and installation drawing with your inquiry.