Three Serial Interfaces
Connect RS232, RS485 or RS422 equipment through one serial-to-Ethernet platform.
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IOT9031A
Three-in-One Serial Device Server
Connect RS232, RS485 and RS422 equipment to Ethernet with transparent data transfer and Modbus RTU/TCP pass-through.
Bridge three common industrial serial interfaces to 10/100M Ethernet through configurable TCP and UDP server or client modes.
Hover to zoomDTECH IOT9031A RS232 to TCP IP serial server on a pure white background
Serial InterfacesRS232 / RS485 / RS422Three-in-one connectivity
Ethernet10/100M RJ45Full / half duplex adaptive
Network ModesTCP / UDPServer and client
Protocol GatewayModbus RTU/TCPBidirectional pass-through
Power InputDC 5VIOT9031A(5V) hardware
Product Overview
A practical path for bringing installed serial equipment into modern industrial data networks.
The IOT9031A integrates a TCP/IP protocol stack to exchange data transparently between Ethernet networks and RS232, RS485 or RS422 serial equipment.
TCP Server, TCP Client, UDP Server and UDP Client modes support different network architectures. The legacy source also documents Modbus RTU/TCP bidirectional pass-through and combined use of RS232 with either RS485 or RS422.
3serial standards
RS232, half-duplex RS485 and full-duplex RS422 support.
10/100Madaptive Ethernet
RJ45 network connection compatible with IEEE 802.3.
>1200msource-stated reach
Long-distance serial communication for distributed field equipment.
4network modes
TCP and UDP server or client operation.
Key Features
Core capabilities selected for reliable integration, flexible deployment and efficient maintenance.
Transparent Bidirectional Transfer
Transfers serial data and Ethernet packets in both directions without changing the application payload.
Modbus RTU/TCP Pass-Through
Supports bidirectional Modbus RTU/TCP communication for industrial monitoring and control systems.
Flexible TCP and UDP Modes
Configure TCP Server, TCP Client, UDP Server or UDP Client operation for the target network.
Adaptive Ethernet
The RJ45 port supports 10/100M Ethernet with full- or half-duplex adaptation.
Wall-Mount Metal Enclosure
A compact metal housing with mounting flanges and RXD, TXD and power indicators supports fixed installations.
Industrial Applications
Explore practical deployment scenarios for this DTECH industrial connectivity product.
Industrial Automation
Connect PLCs, controllers and serial instruments to plant Ethernet networks.
Smart Transportation
Network signal controllers and roadside serial equipment for centralized monitoring.
Access Control
Integrate serial access controllers and attendance equipment with IP-based management systems.
Energy and Data Acquisition
Collect data from meters and Modbus RTU field devices through Ethernet.
System / Network Architecture
See how this product fits into an industrial serial communication network.
RS232 / RS485 / RS422 DevicesController, meter, sensor or serial instrument
Serial data
Protected branches
Ethernet Monitoring SystemSCADA, server, PC or centralized control platform
Technical Specifications
Verified configuration details for engineering review and product selection.
Hardware and Interfaces
- Model
- IOT9031A (5V version)
- Serial interfaces
- RS232, RS485 and RS422
- RS485 mode
- Half duplex
- RS422 mode
- Full duplex
- Ethernet port
- 1 × RJ45, 10/100M adaptive
- Ethernet compatibility
- IEEE 802.3; full / half duplex adaptive
- Power input
- DC 5V
- Controls and indicators
- Reset switch; RXD, TXD and PWR indicators
- Mounting
- Wall-mount flanges
Communication and Network
- Network operating modes
- TCP Server, TCP Client, UDP Server and UDP Client
- Data transmission
- Bidirectional transparent transfer between serial and Ethernet data
- IP configuration
- DHCP supported
- Domain access
- DNS supported
- Industrial protocol
- Modbus RTU/TCP bidirectional pass-through
- Serial transmission distance
- More than 1200 m as stated by the legacy product source
- Dual-interface operation
- RS232 with RS485, or RS232 with RS422; RS485 and RS422 are not used together
Documented Factory Defaults
- Operating mode
- TCP Server
- Device IP
- 192.168.1.200
- Subnet mask
- 255.255.255.0
- Default gateway
- 192.168.1.1
- Module port
- 2000
- Serial framing
- 9600 bps, 8 data bits, 1 stop bit, no parity
Package Contents
- Included
- 1 × serial server; 1 × power adapter; 1 × product instruction card
- Terminal accessory
- 1 × 3.81 mm 6-pin terminal block for applicable serial connections
Related Products
Explore complementary DTECH connectivity products for adjacent signal paths and network requirements.
Frequently Asked Questions
Verified answers for product selection and project planning.
Which serial interfaces does the IOT9031A support?
The IOT9031A supports RS232, half-duplex RS485 and full-duplex RS422 serial communication.
Which TCP and UDP modes are available?
It supports TCP Server, TCP Client, UDP Server and UDP Client operation.
Can RS232 and RS485 be used together?
Yes. The legacy source states that RS232 can be used with RS485, or RS232 can be used with RS422. RS485 and RS422 are not used together.
Does the IOT9031A support Modbus?
Yes. The official product information and manual document Modbus RTU/TCP bidirectional pass-through.
What power input does this hardware version require?
The supplied IOT9031A(5V) hardware image and its product label specify DC 5V input.
Need Help Selecting the Right Product?
Share your device interfaces, network environment and project requirements with the DTECH industrial communication team.