RenKe RS-485 Temperature & Humidity Transmitter — Integration Guide

Model catalog

Search for these models in ThinkLink by name or ID.

Model type	Name	id_name	Platform model ID
RPC	[UMTH4 ACT] 21311	umth4_calib_21311	118656804031721474
RPC	[UMTH4 GET] 21311	umth4_get_21311	118656804031721473
RPC	[UMTH4 SET] 21311	umth4_set_21311	118656804031721472
Template	UMTH4-21311	umth4_21311	118658005754343424
Thing Model	[UMTH4]	umth4_21311	118655647318175744
Thing Model	[RS-21311-UMTH4资产] 区域聚合	umth4_asset_21311	119677174411063301
Parameter Thing Model	[UMTH4-PARA]	umth4_para_21311	118655647318175745

1. Sensor Overview

Item	Value
Device	Temperature & Humidity Transmitter (wall-mount)
Model	UMxTH4xCN8F0
Vendor	RenKe (Shandong RenKe / 建大仁科)
Protocol	Modbus-RTU (RS-485)
Business Code	21311
Connectivity	EdgeBus KC11 mains-powered DTU (LoRaWAN Class C)
Template	UMTH4-21311

A standard RS-485 Modbus-RTU temperature & humidity transmitter, bridged to LoRaWAN through a KC11 mains DTU into the ThinkLink platform for remote real-time monitoring, history curves and threshold alarms.

2. Product Features

Wide-voltage supply DC 10–30V, ultra-low power 0.1W@24V — stable continuous power.
Standard Modbus-RTU / RS-485, communication distance up to 2000m, multi-device bus.
Signed (two's-complement) temperature range (sub-zero capable), humidity 0–100%RH, resolution 0.1.
Temperature/humidity calibration registers (0x0050/0x0051) for remote field calibration.

3. Application Scenarios

Server room / power distribution monitoring: wall-mounted continuous temp/humidity monitoring with threshold alarms.
Warehouse / cold storage / archive rooms: storage-environment compliance (e.g. pharmaceutical GSP).
Greenhouse / farming / industrial workshop: ambient monitoring, can drive dehumidify/ventilation control.

4. Gateway (DTU) Information

4.1 Hardware

Item	Value
DTU model	KC11 (mains version)
Interface	RS-485
DTU power	AC 85–270V (mains)
LoRaWAN Class	Class C (always-on)
Sensor power	DC 10–30V (independent field supply, max 0.1W@24V)

Power supply confirmed as mains: KC11 mains version (Class C), device template MT-EB-POWER.

4.2 Wiring

T&H transmitter (4-wire)     KC11 mains DTU
  V+  (brown) ── DC 10~30V+   (field DC supply)
  V-  (black) ── DC 10~30V-   (field DC supply)
  485-A (yellow) ──────────── RS-485 A
  485-B (blue)   ──────────── RS-485 B

  KC11 own power: AC 85~270V L/N (mains)

Wire	Signal	Connect to
Brown	V+	Field DC 10–30V+
Black	V-	Field DC 10–30V−
Yellow	485-A	KC11 RS-485 A
Blue	485-B	KC11 RS-485 B

KC11 is powered by AC 85–270V mains; the sensor needs its own DC supply (the KC11 mains version does not feed DC to RS-485 sub-devices). Short the 120Ω terminator to 485-A at the bus end if needed.

5. Data Acquisition

Via Modbus-RTU function code 0x03, a single query reads 2 registers from 0x0000 (humidity + temperature).

Query: 01 03 00 00 00 02 C4 0B
Response (e.g. temp -10.1℃ / humidity 65.8%RH): 01 03 04 02 92 FF 9B 5A 3D
- 02 92 = 658 → humidity 65.8%RH
- FF 9B = -101 (two's complement) → temperature -10.1℃

5.1 Register Map

Register (PLC)	Item	Type	R/W	Notes
0x0000 (40001)	Humidity	uint16	R	/10 = %RH, 0–100%
0x0001 (40002)	Temperature	int16	R	/10 = ℃, signed (sub-zero)
0x0050 (40081)	Temp calibration	int16	R/W	/10, field offset
0x0051 (40082)	Humidity calibration	int16	R/W	/10, field offset
0x07D0 (42001)	Device address	uint16	R/W	1–254
0x07D1 (42002)	Baud rate	uint16	R/W	0=2400/1=4800/2=9600

Defaults: 4800 8N1, address 0x01. Note the factory baud rate is 4800 (unlike many 9600 devices).

6. EdgeBus Model

6.1 EB Config

Item	Value
name / port	umth4 / 22
version / dataType	0x87 / 0x10
upPeriodIndex	app_70
periodIndex	app_74
indexAPP (Modbus addr)	app_150
Serial	4800 8N1
Battery	false (mains, Class C)
BzType / BzVersion / SwVersion	21311 / 1 / 31

6.2 EB Code

typescript

import { Buffer } from "buffer";
import { buildOtaFile } from "@EBSDK/run";
import {
    ActionAfertExpr, CalcData,
    CrcMode,
    CvtRule,
    EBBuffer,
    EBModel,
    ExprCondition,
    LoraUpEvent,
    QueryEvent, SetUpCovDataType,
    UserConfUPItem, EventInfoItem, QuItemModBus, TypeVal, ValItem, EventConfig, Utils, UserConfQueryItem
} from "@EBSDK/EBCompiler/all_variable";
import { CheckbitEnum, getOtaConfig, HwTypeEnum, UpgrdTypeEnum } from "@EBSDK/otaConfig";
////////////////////////////////////////////////////////////////////////////////////////

const eventInfo:UserConfUPItem[]=[
    {
        name:"umth4", port:22, version:"0x87",dataType:"0x10",upPeriodIndex:70,
        quInfo:[{
            protocol:"modbus",addr:"0x01",code:"0x03", periodIndex:74,
            indexAPP:150, indexCMD:0, copySize:1,isLast:false,
            listVal:[
                { start: "0x0000", end: "0x0000" ,covType:"Uint16BE",covAppIndex:112},
                { start: "0x0001", end: "0x0001" ,covType:"Int16BE",covAppIndex:110},
            ]
            }
        ]
    }
]
let otaConfig = getOtaConfig({
    BaudRate: 4800,
    StopBits: 1,
    DataBits: 8,
    Checkbit: CheckbitEnum.NONE,
    Battery: false,
    ConfirmDuty: 60,
    BzType: 21311,
    BzVersion: 1
})
const MODBUS_TT = (ebModel: EBModel) => {
    for (let i=0; i<eventInfo.length; i++){
        let event=new EventInfoItem(eventInfo[i]);
        event.upEventSetup()
        event.eventInstall()
    }
    return JSON.stringify(ebModel, null, 2)
}
buildOtaFile(import.meta.url, otaConfig, MODBUS_TT)

6.3 Notes

One uplink event, one Modbus query: FC03 reads 2 registers from 0x0000 (humidity 0x0000 + temperature 0x0001).
COV enabled: humidity threshold app_112, temperature threshold app_110 — uplink on change; upload period app_70 is the fallback window.
Uplink frame dataLen = 6 + 4: first 6 bytes are the standard DTU header (battery@4); bytes 6-7 = humidity register, bytes 8-9 = temperature register.
Modbus target address is dynamically injected from app_150 (factory default 0x01).

7. Thing Model

7.1 Basic Info

Type	Name	id Name
Telemetry	[UMTH4]	umth4_21311
Parameter	[UMTH4-PARA]	umth4_para_21311

7.2 Uplink Frame

frameInfo: port 22, dataLen -1 (auto), rssi true, battery true, tagList [{0:0x87},{1:0x10}]

index	field_name	type	Notes
6	humidity	uint16be	/10 %RH
8	temperature	int16be	/10 ℃ (signed)

7.3 Thing Model Script

Telemetry umth4_21311 (appInfo):

javascript

let appInfo = [
    {name: "humidity", field_name: "humidity", unit:"%RH", index: 6, type: "uint16be", coefficient: 0.1, decimal:1},
    {name: "temperature", field_name: "temperature", unit:"℃", index: 8, type: "int16be", coefficient: 0.1, decimal:1}
]

Parameter umth4_para_21311: parses PTL-D01 params on port 214 (app_20/38/40/70/74/110/112/150); on other ports advances the RPC state machine via Utils.paraCheck and writes back shared_attrs.

8. Third-Party Subscription

8.1 MQTT Topic

/v32/{Organization Account}/tkl/up/telemetry/{eui}

8.2 Sample Payload

json

{
    "eui": "6353012af10a9331",
    "active_time": "2026-06-14T08:35:48.000Z",
    "thingModelId": "118655647318175744",
    "thingModelIdName": "umth4_21311",
    "telemetry_data": {
        "snr": 13.5,
        "rssi": -51,
        "battery": 3.37,
        "humidity": 65.8,
        "temperature": 23.5
    }
}

9. RPC

9.1 RPC Names

Type	Name	id Name
Set	[UMTH4 SET] 21311	umth4_set_21311
Get	[UMTH4 GET] 21311	umth4_get_21311
Calibration	[UMTH4 ACT] 21311	umth4_calib_21311

9.2 Parameter Definitions

Slot	Name	field_name	Range/Unit	Description
app_38	Power-on delay	pwron_delay	≥100 ms	Settle time before query
app_40	Heartbeat period	period_heart	60–86400 s	Mains default 24h; <1h auto-raised
app_70	Upload period	period_up	1–86400 s	Cloud upload interval (COV fallback)
app_74	Collect period	period_read	1–86400 s	DTU poll interval
app_110	Temp COV threshold	cov_temperature	/10 ℃	Uplink on temp change over threshold
app_112	Humidity COV threshold	cov_humidity	/10 %RH	Uplink on humidity change over threshold
app_150	Modbus address	addr_modbus	1–247	DTU query target address

9.3 RPC Code

Set umth4_set_21311: per KB-25, sets period + power-on delay (app_38) + heartbeat (app_40) together; heartbeat <1h auto-raised to 24h for power saving.
Get umth4_get_21311: sends read-only frame to port 214; the parameter thing model parses and writes back shared_attrs.
Calibration umth4_calib_21311: variant dropdown selects temp/humidity calibration, writes 0x0050/0x0051 via FC06 transparent (signed, /10), echo-verified then writes back shared_attrs.

10. Template Selection

Search in ThinkLink:

UMTH4-21311

Or by business type:

21311 / Temperature-Humidity Transmitter

11. Additional Notes

Factory defaults: address 0x01, 4800 8N1. Change baud via register 0x07D1 (0=2400/1=4800/2=9600).
Change device address via register 0x07D0 (1–254).
Calibration values are signed offsets (two's complement), written via the calibration RPC over FC06; can be negative.
Heartbeat: the template ships a short heartbeat (900s) for commissioning connectivity; after the Set RPC it is auto-raised to 24h to save power.

LoRaWAN Gateway

Application Notes

LoRaWAN EB Collector

LoRaWAN Sensor

Network Server

Device

meter

BMS

Industry

RenKe RS-485 Temperature & Humidity Transmitter — Integration Guide

Model catalog

1. Sensor Overview

2. Product Features

3. Application Scenarios

4. Gateway (DTU) Information

4.1 Hardware

4.2 Wiring

5. Data Acquisition

5.1 Register Map

6. EdgeBus Model

6.1 EB Config

6.2 EB Code

6.3 Notes

7. Thing Model

7.1 Basic Info

7.2 Uplink Frame

7.3 Thing Model Script

8. Third-Party Subscription

8.1 MQTT Topic

8.2 Sample Payload

9. RPC

9.1 RPC Names

9.2 Parameter Definitions

9.3 RPC Code

10. Template Selection

11. Additional Notes

LoRaWAN Gateway

Application Notes

LoRaWAN EB Collector

LoRaWAN Sensor

meter

BMS

Industry

RenKe RS-485 Temperature & Humidity Transmitter — Integration Guide ​

Model catalog ​

1. Sensor Overview ​

2. Product Features ​

3. Application Scenarios ​

4. Gateway (DTU) Information ​

4.1 Hardware ​

4.2 Wiring ​

5. Data Acquisition ​

5.1 Register Map ​

6. EdgeBus Model ​

6.1 EB Config ​

6.2 EB Code ​

6.3 Notes ​

7. Thing Model ​

7.1 Basic Info ​

7.2 Uplink Frame ​

7.3 Thing Model Script ​

8. Third-Party Subscription ​

8.1 MQTT Topic ​

8.2 Sample Payload ​

9. RPC ​

9.1 RPC Names ​

9.2 Parameter Definitions ​

9.3 RPC Code ​

10. Template Selection ​

11. Additional Notes ​

RenKe RS-485 Temperature & Humidity Transmitter — Integration Guide

Model catalog

1. Sensor Overview

2. Product Features

3. Application Scenarios

4. Gateway (DTU) Information

4.1 Hardware

4.2 Wiring

5. Data Acquisition

5.1 Register Map

6. EdgeBus Model

6.1 EB Config

6.2 EB Code

6.3 Notes

7. Thing Model

7.1 Basic Info

7.2 Uplink Frame

7.3 Thing Model Script

8. Third-Party Subscription

8.1 MQTT Topic

8.2 Sample Payload

9. RPC

9.1 RPC Names

9.2 Parameter Definitions

9.3 RPC Code

10. Template Selection

11. Additional Notes