RS-232 IoT Gateway

  • 32-bit, ARM, Multi-Core, Qualcomm SoC for LTE communication.
  • Transparent RS-232 Full Duplex Data transfer.
  • Supports multiple frame formats and Baud Rates.
  • SSL/TLS, Other
  • Commercial (0 to 70°C), Extended, Industrial (-40 to 85°C)
  • Mounting/Form Factor: DIN Rail
  • Power: 24 Volt DC (24VDC), DC, Terminal Block, Other
  • Availability: APAC, Australia, Canada, China, EMEA, EU, Japan, Korea, LATAM, New Zealand, UK, USA, Other
  • Made in India

With a maximum data rate of 115200bps, it is used in serial communication up to 50 feet. RS-232 connects Data Transmission Equipment (DTE) and Data Communication Equipment (DCE).

RS-232, also known as RS-232C and TIA/EIA-232-E, is a set of electrical, functional, and mechanical specifications used between computers, terminals, and modems.

Universal Asynchronous Data Receiver & Transmitter (UART) used in connection with RS-232 for transferring data between printer and computer. Microcontrollers cannot handle such voltage levels, so connectors are connected between RS-232 signals. The DB-9 connector is a serial port that comes in two types: male (DTE) and female (DCE).


  1. RS-232 is a point-to-point asynchronous communication protocol.
  2. An RS-232 IoT gateway transmits data from one device to another usually over wired LANs or Wi-Fi networks.
  3. It allows communication between devices that are physically impossible to connect.
  4. This device has a LAN port, 802.11 b/g/n WLAN, and a serial server with RS-232 IoT Gateway connectivity options.
  5. It connects IEEE 802.11b/g/n network devices with serial and Ethernet ports.
  6. It supports Virtual COM, TCP server/client, UDP server/client, and HTTPS client.
  7. It offers Modbus RTU and Modbus TCP support.
  8. Despite only having one RJ45 Ethernet interface, it offers numerous networking options.
  9. Specific MQTT/SSL firmware.
  10. The RS-232 interface (TIA / EIA-232) is used to transfer data between the transmitter or terminal (Data Terminal Equipment, DTE) and the receiver or communication equipment (Data Communications Equipment, DCE) in the point-to-point scheme.
  11. The RS-232 speed depends on the distance between the devices, usually 9600 bits per second at 15 meters.
  12. Hardware can support speeds up to 921.6 kbps, but the minimum distance is usually 115.2 kbps.
  13. As RS-232 operates in full-duplex mode, you can send and receive information simultaneously as separate lines are used for receiving and transmitting.
  14. It is used for shorter distances and lower data rates.
  15. Signals are sent over unbalanced or single-ended lines.
  16. As far as electrical characteristics are concerned, logic level 0 is defined as equal to or more positive than +3V, while logic level 1 is defined as equal to or more negative than -3V. The signals use negative logic. In addition, the protocols state that input signals between -3V and +3V are undefined.

Hardware Interface

  1. DB9 connector
  2. DC Barrel Jack Connector
  3. Ethernet interface
  4. Wi-Fi antenna
  5. Operating voltage between 5v-60v
  6. Wi-Fi 802.11b/g/n compatibility
  7. Ethernet up to 10Mbps
  8. Dual-core ARM controller
  9. Hard reset button
  10. 4G-LTE Cat-1 industrial modem inbuilt
  11. IP41-rated EMI-proof metal casing

Specifications of RS-232 IoT Gateway


1x LAN port


1 x 802.11b/g/n Wi-Fi interface


(Rx/TX) Max 16K bytes


2 KV Electromagnetic isolation for Ethernet port

Network Protocol

IP/TCP/UDP/DHCP/DNS/https/ARP/ ICMP/WebSocket/https client

Speed Rate

10 Mbps

Wi-Fi Certificate



802.11 b/g/n

Frequency Range














Interface Standard



Input Voltage


Operating Temperature

-40℃~ 85℃

Storage Temperature

-40℃~ 125℃



Network Mode






Work Mode

Transparent transmission, serial AT, https Client, ModbusTCP <=>Modbus RTU

Max. Client Number in TCP Server Mode



Web server


Q1: What is an RS-232 IoT gateway?
  • A1: RS-232 IoT gateway enables communication between RS-232 serial devices and the Internet of Things (IoT) ecosystem. It acts as a bridge, allowing traditional RS-232 devices to send and receive data over the internet, facilitating seamless integration with IoT platforms.
Q2: What types of RS-232 devices can be connected to the IoT gateway?
  • A2: The RS-232 IoT gateway can connect a wide range of RS-232 devices, including industrial equipment, sensors, barcode scanners, modems, and other legacy devices that use the RS-232 serial communication standard.
Q3: Can the RS-232 IoT gateway operate in remote and challenging environments?
  • A3: Yes, many RS-232 IoT gateways are built to withstand harsh environmental conditions. They often have rugged designs, wide operating temperature ranges, and protection against electrical interference. This makes them suitable for both industrial and remote outdoor deployments.
Q4: What are the advantages of an RS-232 IoT gateway?
  • A4: RS-232 IoT Gateway has several advantages over other serial communication methods, including its ability to tolerate electrical noise, long cable runs, support for multiple slaves, and quick data transmission.
  • Do you have any questions about the RS-232 IoT gateway? Let HashStudioz help you with your needs!


Q1: What is the purpose of a 4G-LTE RS-485 Modbus Gateway with 10 Digital Inputs?
  • A1: The 4G-LTE RS-485 Modbus Gateway with 10 Digital Inputs is designed to enable communication between remote devices using Modbus protocol over a 4G-LTE network. It also allows monitoring of up to 10 digital input signals with a minimum read time of 0.5 seconds.
Q2: Is it possible to expand the number of digital inputs?
  • A2: No, the 4G-LTE Modbus Gateway is designed with a fixed number of 10 digital inputs. If you require more inputs, you may consider using additional gateways or using external devices to aggregate and communicate the signals
Q3. What are the main features of the 4G-LTE RS-485 Modbus Gateway?
  • A3: The main features of this gateway include:
    • 4G-LTE connectivity for remote communication
    • RS-485 interface for connecting Modbus devices
    • 10 digital input channels for monitoring signals
    • Support for Modbus RTU and Modbus ASCII protocols
    • Built-in SIM card slot for mobile network connectivity
    • Secure and reliable communication with encryption and authentication
Q4: Is the gateway compatible with all Modbus devices?
  • A4: The gateway supports both Modbus RTU and Modbus ASCII protocols, making it compatible with a wide range of Modbus devices. However, it is recommended to consult the gateway's documentation or contact the manufacturer for specific compatibility details.
Q5: How can digital inputs be utilized?
  • A5: The 4G-LTE Modbus Gateway has 10 digital input channels that can monitor the status of various devices or signals. For example, they can monitor the status of sensors, switches, alarms, or any other digital signal. The input channels can be configured to trigger specific events or actions based on the detected signal changes.
Q6: Can the gateway be accessed remotely for configuration and monitoring?
  • A6: Yes, the 4G-LTE Modbus Gateway can be remotely accessed through the mobile network connection. It provides various methods for remote configuration, monitoring, and data retrievals, such as web-based interfaces, APIs, or specific software provided by the manufacturer.
Q7: What is the power supply requirement for the 4G-LTE Modbus Gateway?
  • A7: Typically, the gateway operates on a 12V DC power supply, but it's always recommended to refer to the product's specifications or user manual for accurate power supply requirements.
Q8: Does the gateway offer any security features?
  • A8: Yes, the 4G-LTE Modbus Gateway has built-in security features to protect communication and data integrity. These include encryption, authentication, and secure protocols to ensure a secure connection between the gateway and the connected devices.