> For the complete documentation index, see [llms.txt](https://wimaniot.gitbook.io/wiman-communication-technologies/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wimaniot.gitbook.io/wiman-communication-technologies/communication/4g-gateways/wt400m-lte-4gpro.md).

# WT400M-LTE-4GPRO

### **Wiman 4G - PRO Gateway Series**

**The Wiman PRO 4G Gateway** is a robust industrial IoT solution designed to deliver reliable connectivity over **cellular 4G networks**, enabling seamless integration of **RTU/TCP Modbus, IO, and LoRa devices** with cloud servers . Operating exclusively on 4G, it is ideally suited for remote and industrial environments where wired LAN or Wi-Fi infrastructure is unavailable.

The gateway supports secure **bidirectional communication** through **TCP, HTTP, and MQTT protocols with SSL encryption**, ensuring safe and stable data transmission. Its **dual-server functionality** allows simultaneous data delivery to two independent servers, improving redundancy and overall system reliability.

Equipped with **inbuilt data logging and expandable SD card storage**, the device prevents data loss during network or server interruptions by storing logs locally and automatically synchronizing once connectivity is restored. With flexible **remote configuration via SMS, PC utility, FTP, or server IP commands**, the Wiman PRO 4G Gateway is well-suited for industrial automation, SCADA, remote monitoring, and smart utility applications that demand dependable long-range communication.

<figure><img src="/files/aZc7R4okdVCqGBBq3ReZ" alt=""><figcaption><p><strong>DIN RAIL MODEL</strong></p></figcaption></figure>

<figure><img src="/files/S0Wc774Vw782QKPBshs4" alt=""><figcaption><p><strong>WALL MOUNTED MODEL</strong></p></figcaption></figure>

<table><thead><tr><th width="98">DIN PIN</th><th width="101.5">FM PIN</th><th width="104.5">Section</th><th width="100">Label</th><th width="141">Type</th><th>Purpose</th></tr></thead><tbody><tr><td>1</td><td>1</td><td>Power</td><td>+12V</td><td>Input</td><td>DC Power +12V to +24V</td></tr><tr><td>2</td><td>2</td><td>Power</td><td>GND</td><td>Input</td><td>Power Ground</td></tr><tr><td>3</td><td>3</td><td>COM</td><td>D+/TX</td><td>Comm</td><td>RS485 Positive / TX</td></tr><tr><td>4</td><td>4</td><td>COM</td><td>D-/RX</td><td>Comm</td><td>RS485 Negative / RX</td></tr><tr><td>5</td><td>8</td><td>(4–20 mA)</td><td>AI–</td><td>Analog</td><td>Current Input –</td></tr><tr><td>6</td><td>7</td><td>(4–20 mA)</td><td>AI+</td><td>Analog</td><td>Current Input +</td></tr><tr><td>7</td><td>6</td><td>ADI</td><td>ADI-2</td><td>Analog/Digital</td><td>Configurable Input</td></tr><tr><td>8</td><td>5</td><td>ADI</td><td>ADI-1</td><td>Analog/Digital</td><td>Configurable Input</td></tr><tr><td>9</td><td>11</td><td>Relay</td><td>NO</td><td>Output</td><td>Normally Open Contact</td></tr><tr><td>10</td><td>12</td><td>Relay</td><td>COM</td><td>Output</td><td>Relay Common</td></tr><tr><td>11</td><td>9</td><td>DI</td><td>DI3</td><td>Digital , Pluse</td><td>Digital Input</td></tr><tr><td>12</td><td>10</td><td>DI</td><td>DI4</td><td>Digital , Pluse</td><td>Digital Input</td></tr></tbody></table>

### 📌 **Limitless Applications (GSM / 4G Use-Cases)**

These are applications where **cellular connectivity** is important (remote or unstable networks):

* Smart Meter Reading
* Power Monitoring & Control
* PLC & Industrial Automation (Industry 4.0)
* Temperature & Alert Systems
* Pump & Flow Monitoring
* SCADA, Solar & Windmill Monitoring
* ATM, Cold Storage, Home Automation

Why GSM matters here:\
These sites are often **far from LAN/Wi-Fi**, so 4G is the only reliable link.

***

### ⭐ **Highlight Features (GSM Gateway – MAX Series)**

Core functional features:

* RS485 / TCP / IO with Data Logger
* Dual Server Support (64MB + 64MB logger)
* Up to **17,500 logs per server**
* Supports **64 Modbus slaves**
* Reads up to **3000 Modbus words**
* Modbus Read/Write (Transparent + JSON)
* Stores data during network failure
* Supports TCP / HTTP / MQTT
* SSL Security for 4G
* Configurable JSON / CSV formats
* Scheduled / Event / Offline Polling
* Edge Triggers for Relay / Modbus Write
* SMS for Configuration & Alerts
* OTA (Remote Firmware Update)
* Local Console for Packet Monitoring
* Separate packet format per server

Engineering meaning:\
This device is not “just a modem”—it’s a **mini industrial computer** with memory and logic.

### ⚙️ **Technical Specifications – GSM / Cellular**

#### 📡 GSM / LTE Bands

| Network Type | Region | Supported Bands                    |
| ------------ | ------ | ---------------------------------- |
| LTE FDD (4G) | Asia   | B1 / B3 / B5 / B8                  |
| LTE FDD (4G) | Europe | B1 / B3 / B5 / B7 / B8 / B20 / B28 |
| LTE TDD (4G) | Asia   | B34 / B38 / B39 / B40 / B41        |
| LTE TDD (4G) | Europe | B38 / B40 / B41                    |
| GSM (2G)     | Asia   | B3 / B8                            |
| GSM (2G)     | Europe | B2 / B3 / B5 / B8                  |

***

#### 📶 Bandwidth & SIM

| Parameter     | Specification                  |
| ------------- | ------------------------------ |
| Bandwidth     | 1.4 / 3 / 5 / 10 / 15 / 20 MHz |
| SIM Interface | Internal SIM (1.8V / 3V)       |

***

### 🌐 **General Communication**

#### Supported Protocols

| Type                | Details         |
| ------------------- | --------------- |
| Transport Protocols | TCP, HTTP, MQTT |
| Security            | SSL (4G)        |
| HTTP Methods        | GET, POST       |
| Data Format         | JSON, CSV       |

***

#### Configuration & OTA

| Category      | Methods                                  |
| ------------- | ---------------------------------------- |
| Configuration | SMS, PC Utility, FTP, Server IP Commands |
| OTA Update    | FTP, HFS, TCP, SMS, IP Command           |

***

### 🔌 **Interfaces**

#### Power Supply

| Parameter     | Value                       |
| ------------- | --------------------------- |
| Input Voltage | 12V – 24V DC                |
| Protection    | Reverse Polarity Protection |

***

#### Input / Output Ports

| Type                 | Specification |
| -------------------- | ------------- |
| Analog/Digital Input | 2 × (0–24V)   |
| Digital Input        | 2 × (0–24V)   |
| Current Input        | 1 × (4–20mA)  |
| Relay Output         | 1 Channel     |

***

#### Communication Ports

| Port             | Function                 |
| ---------------- | ------------------------ |
| RS485            | Modbus Device Connection |
| USB Type-C       | PC Configuration         |
| RJ45 Ethernet    | LAN Communication        |
| External Antenna | GSM Connectivity         |

***

#### Indicators (LED)

| Indicator | Status               |
| --------- | -------------------- |
| Power     | Device Power         |
| GSM       | Network Status       |
| Modbus    | Communication Status |

***

### 📦 **General Specifications**

| Parameter             | Value                          |
| --------------------- | ------------------------------ |
| Dimensions            | 22.6 × 99 × 113.65 mm          |
| Weight                | 130 g                          |
| Operating Voltage     | 12V – 24V DC                   |
| Operating Temperature | -30°C to +85°C                 |
| Connector Type        | Micro Fit-5.0 (8-pin / 12-pin) |

***

### 🔁 **Serial Specifications**

#### Interface

| Parameter        | Value         |
| ---------------- | ------------- |
| Serial Interface | RS232 / RS485 |

***

#### Baud Rate

| Supported Baud Rates (bps) |
| -------------------------- |
| 2400                       |
| 4800                       |
| 9600                       |
| 19200                      |
| 38400                      |
| 57600                      |
| 115200                     |

***

#### Data Format

| Parameter | Options           |
| --------- | ----------------- |
| Data Bits | 7 / 8             |
| Parity    | None / Even / Odd |