Milestone Electronics
RS232 Splitter 1 In and 2 Out
The ML-102SDMF is an RS232 splitter designed for high-speed data transmission between a computer system and multiple peripherals. It accepts one RS232 input and distributes it simultaneously to two RS232 outputs, with a built-in mains power supply and front panel LED indicators for live signal monitoring.
- 1 composite AV input distributed to 4 independent AV outputs
- Audio and video signals transmitted together without delay or mismatch
- Each output individually managed and amplified for consistent signal strength
- Video bandwidth up to 90 MHz (-3dB) with 75-ohm impedance matching
- Rugged metal enclosure with captive screw audio connectors for fixed installations
Max Resolution
1080p Full HD
Audio Input
Stereo Analogue
Output
Single HDMI
- In-house manufactured
- 24hr response
- 2,000+ clients served
Product Overview
What the ML-102SDMF delivers
The Milestone ML-102SDMF is an RS232 splitter engineered for high-speed serial data transmission. It accepts a single RS232 input from a computer or controller and distributes that signal simultaneously to two RS232 outputs, allowing one source device to communicate with two peripherals at the same time without requiring additional cabling infrastructure or software intervention.
The unit uses a D9 Male connector on the input side, carrying the TxD, RxD, and GND signals. Both outputs are provided via D9 Female connectors, each carrying the same TxD, RxD, and GND signals, ensuring full compatibility with standard RS232 peripheral devices. This symmetrical connector arrangement makes integration into existing serial setups direct and straightforward.
A built-in mains power supply operates at 230V, 50 Hz with a maximum capacity of 50 VA, eliminating the need for an external power adapter. The front panel carries four LED indicators: Power, Tx, Rx1, and Rx2, providing immediate visual confirmation of power status and active data transmission on each output channel. This makes the unit simple to monitor during operation without requiring additional test equipment.
The ML-102SDMF is suited to industrial and commercial environments where RS232 serial communication is used across multiple devices. Its applications span factory automation systems, programmable logic controllers, attendance recording systems, barcode readers, remote data terminals, EPABX systems, and remote data transmission networks.
Input
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Key Features
Flexible, isolated relay switching for 230V loads
Multiple control interfaces, optical isolation, exclusive relay pairing, and battery-backed status memory in a single rack-mountable unit.
1 Input to 2 Output RS232 Splitting
The ML-102SDMF accepts a single RS232 input and simultaneously distributes it to two independent RS232 outputs. This allows one source device to communicate with two peripherals at the same time, removing the need to duplicate source equipment or reconfigure cabling when connecting to multiple serial devices.
- Single D9 Male input feeds two D9 Female outputs
- Both outputs carry TxD, RxD, and GND signals
- Simultaneous data distribution to both connected peripherals
Built-In Mains Power Supply
The unit incorporates a self-contained mains power supply rated at 230V, 50 Hz with a maximum capacity of 50 VA. No external power adapter or separate PSU is required. This simplifies installation and reduces the number of components to manage in an equipment rack or industrial panel.
- Mains input: 230V, 50 Hz
- Maximum power capacity: 50 VA
- No external power adapter required
Front Panel LED Signal Indicators
Four LEDs on the front panel provide at-a-glance monitoring of the unit's operational status. The Power LED confirms the unit is receiving mains supply, while the Tx, Rx1, and Rx2 LEDs indicate active data transmission on the input and each output channel respectively. This eliminates the need for external test equipment during commissioning and troubleshooting.
- Relay status preserved across power cycles
- No manual relay reinstatement required after power restoration
Standard D9 Connector Interface
The ML-102SDMF uses the standard D9 connector format throughout: a D9 Male connector on the input port and D9 Female connectors on both output ports. This ensures direct compatibility with the RS232 ports found on computers, PLCs, barcode readers, and other standard serial devices, without the need for adapter cables.
- D9 Male connector on input port (Pin 2: Rx, Pin 3: Tx, Pin 5: GND)
- D9 Female connectors on both output ports (Pin 2: Tx, Pin 3: Rx, Pin 5: GND)
- Compatible with standard RS232 serial devices
High-Speed Serial Data Transmission
The ML-102SDMF is designed specifically for high-speed RS232 data transmission, maintaining signal integrity across both output ports. This makes it reliable for time-sensitive industrial and commercial applications where data accuracy and transmission speed are critical, including programmable logic controllers, factory automation systems, and remote terminal environments.
- Designed for high-speed RS232 data transmission
- Consistent signal integrity across both outputs
- Suitable for industrial and real-time serial communication applications
Industrial-Grade Build for Continuous Operation
Manufactured by Milestone Electronics with an in-house R&D and quality control process, the ML-102SDMF is built to operate reliably in industrial settings. The self-contained enclosure with integrated power supply is suitable for permanent installation in equipment panels, control rooms, and data communication racks where continuous unattended operation is required.
- In-house manufactured and quality controlled
- Suitable for permanent, continuous installation
- Compact form factor for panel and rack mounting
Installation
Connecting the RS232 input and two outputs
The ML-102SDMF connects one RS232 source to two peripheral devices using standard D9 connectors. The input and output pin assignments are defined and fixed, ensuring consistent integration with any standard RS232 equipment.
01
Connect the RS232 Input
Attach the RS232 source device to the D9 Male input connector on the ML-102SDMF. The input port uses Pin 2 as Rx (input), Pin 3 as Tx (output), and Pin 5 as Signal Ground. This is the standard RS232 DTE pin assignment for a D9 Male connector. The source device may be a computer, PLC, EPABX controller, or any equipment with an RS232 serial port.
02
Connect the RS232 Outputs
Connect the two peripheral devices to the D9 Female output connectors labelled Output 1 and Output 2. Each output port uses Pin 2 as Tx (output), Pin 3 as Rx (input), and Pin 5 as GND. Both outputs receive the same RS232 signal simultaneously from the input source. Peripherals such as barcode readers, remote terminals, PLCs, or attendance recorders can be connected to these output ports.
Where the ML-102SDMF performs
Designed for industrial and commercial environments that require reliable RS232 signal distribution from one source to two serial peripherals simultaneously.
Factory Automation
Used to distribute RS232 control signals from a central computer or controller to two automation devices on the production floor simultaneously, reducing the need for duplicate controller connections across manufacturing equipment.
Programmable Logic Controllers
Connects a single PLC serial output to two separate field devices or monitoring terminals, enabling parallel serial communication in automated control environments without additional PLC output ports.
Attendance Recording Systems
Distributes RS232 data from an attendance recording device or access controller to both a local terminal and a remote data storage system simultaneously, supporting parallel data logging without additional hardware.
Barcode Reader Systems
Allows the output of a single barcode reader or scanner to be fed to two receiving systems, such as a point-of-sale computer and a separate inventory management terminal, without requiring additional barcode reading hardware at each point.
EPABX and Telephone Systems
Provides serial signal distribution from an EPABX system to two connected serial monitoring or logging devices, enabling call data and control signals to be received at two points from a single RS232 source connection on the EPABX unit.
Remote Data Transmission and Remote Terminals
Enables a single RS232 data source to transmit to two remote terminals or receiving stations simultaneously, supporting distributed data communication setups where the same serial data stream must reach two separate points in a facility or remote installation.
Full specification sheet
- Relay Output
- Output
Output Interface
- Front Panel Indicators
- Power
FAQs about the RS232 Splitter ML-102SDMF
What does the ML-102SDMF RS232 Splitter do?
The ML-102SDMF is an RS232 splitter that accepts one RS232 input from a computer or serial source device and distributes it simultaneously to two RS232 output ports. This allows a single RS232 source to communicate with two peripheral devices at the same time, without requiring any additional software configuration or hardware duplication of the source device.
What connectors does the ML-102SDMF use?
The input port uses a D9 Male connector carrying TxD, RxD, and GND signals. Both output ports use D9 Female connectors, also carrying TxD, RxD, and GND signals. These are standard RS232 D-sub 9-pin connectors compatible with the serial ports found on computers, PLCs, barcode readers, and other serial peripherals. No adapter cables are typically required for standard RS232 devices.
What do the front panel LEDs indicate?
The ML-102SDMF has four LEDs on its front panel. The Power LED confirms the unit is receiving mains supply and is operational. The Tx LED illuminates when data is being transmitted from the input source. The Rx1 and Rx2 LEDs indicate active data reception on Output 1 and Output 2 respectively. These indicators allow the user to verify signal activity on each channel without requiring external test equipment.
Does the ML-102SDMF require an external power supply?
No. The ML-102SDMF has a built-in mains power supply that operates at 230V, 50 Hz with a maximum capacity of 50 VA. This is integrated directly into the unit, so no external adapter or separate power unit is required. The unit plugs directly into a mains socket, simplifying installation and reducing cabling complexity in equipment panels or control rooms.
What are the typical applications for the ML-102SDMF?
The ML-102SDMF is designed for use in factory automation systems, programmable logic controllers, attendance recording systems, barcode readers, EPABX telephone systems, remote data transmission environments, and remote terminal setups. Any application where a single RS232 serial source needs to communicate simultaneously with two separate serial devices can benefit from this splitter.
What is the pin assignment for the input and output connectors?
On the D9 Male input connector, Pin 2 is Rx (Input), Pin 3 is Tx (Output), and Pin 5 is Signal Ground. On each D9 Female output connector, Pin 2 is Tx (Output), Pin 3 is Rx (Input), and Pin 5 is GND. This follows the standard RS232 DTE and DCE pin assignment convention for D9 connectors and ensures compatibility with most commercially available RS232 serial cables and devices.
Can the ML-102SDMF be used for bidirectional RS232 communication on both outputs?
The ML-102SDMF distributes the RS232 signal from the input to both outputs simultaneously. Both output ports carry TxD and RxD lines in addition to GND, which supports the signal lines required for RS232 communication. For specific bidirectional communication requirements and data flow control in your application, contact the Milestone Electronics team directly to confirm suitability for your setup.
What is the maximum power consumption of the ML-102SDMF?
The ML-102SDMF has a maximum power consumption of 50 VA. The built-in power supply is rated for mains input at 230V, 50 Hz. This self-contained design means the full power budget is managed internally, and no additional provision needs to be made for an external power adapter when installing the unit in a panel, rack, or equipment cabinet.
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