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Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.
The Black Box TL421A is a passive splitter designed to distribute a single RS-232 serial data signal to up to four separate devices. This unit is ideal for scenarios where you need to connect multiple serial peripherals or controllers to a single host system without requiring additional serial ports or complex configuration. Its passive nature means it requires no external power, simplifying deployment in environments where power outlets are scarce or for devices that cannot accommodate additional power draws. The TL421A is suited for applications such as connecting multiple serial printers, barcode scanners, or control interfaces to a single PC or industrial controller.
This splitter is compatible with any device utilizing the RS-232 serial communication standard. It functions by passively duplicating the transmit (TX) and receive (RX) data lines. It is designed to work with standard RS-232 signals and does not perform any signal conversion or buffering. Ensure that the connected devices have appropriate termination or impedance matching if required by their specific serial interfaces. It is suitable for use with various industrial automation equipment, point-of-sale systems, and legacy serial devices that require a shared data stream.
Installation involves connecting the single RS-232 source to the input port and then connecting the four output RJ45 ports to the respective serial devices. Since the TL421A is passive, no power supply is needed. Ensure that the total load on the TX and RX lines does not exceed the capabilities of the source device. For optimal performance and signal integrity over longer distances, consider the impedance characteristics of the connected cables and devices. The unit is housed in a compact black enclosure suitable for integration into existing control panels or equipment racks.
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
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