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The Black Box SP385A-R3 is a professional opto-isolated USB-to-RS232 media converter that provides safe, reliable, and compliant connectivity between modern USB ports and RS-232 serial devices. Featuring built-in optical isolation, it safeguards connected systems from surges, spikes, and ground loop interference, ensuring secure industrial and commercial applications.
As a genuine Black Box connectivity solution, the SP385A-R3 offers seamless data transmission, rugged dependability, and plug-and-play support, making it an essential tool for IT managers, engineers, and field technicians bridging legacy RS232 equipment with modern USB interfaces.
Supports full RS232 signaling for DTE and DCE devices, providing bidirectional communication with baud rates up to 921.6 kbps. Its 2 kV opto-isolation and ESD protection guarantee signal integrity and device safety, even in challenging industrial environments.
The SP385A-R3 operates directly from USB power without requiring an external supply. Featuring a rugged, compact enclosure, status LEDs for visual diagnostics, and included drivers for universal operating system support, it offers flexibility in labs, automation systems, and field deployments.
The Black Box SP385A-R3 ensures seamless and protected serial-to-USB connectivity. Built-in opto-isolation shields devices from electrical damage, while robust design and diagnostic indicators provide consistent performance across automation, point-of-sale, and SCADA environments where uptime and compliance are critical.
| Specification | Details |
|---|---|
| Part Number | SP385A-R3 |
| Brand | Black Box |
| Product Type | USB to RS232 Media Converter |
| Isolation | 2 kV Opto-Isolation |
| Interface 1 | USB 2.0 Type A (host) |
| Interface 2 | RS232 (DB9 Male) |
| Supported Signals | Full RS232 (DCD, DTR, TX, RX, RTS, CTS, DSR, RI, GND) |
| Baud Rate | Up to 921.6 kbps |
| Indicators | LEDs for TX/RX activity, Power |
| Power Source | USB bus powered (no external supply) |
| Operating Systems | Windows, Linux, macOS (driver support) |
| Cable Length | 1.5 m integrated USB cable |
| Enclosure | Rugged compact case |
| Operating Temperature | 0°C to 50°C |
| Storage Temperature | -20°C to 70°C |
| Humidity | 5% – 95% non-condensing |
| Compliance | USB 2.0, EIA/TIA RS-232 standards |
| Certifications | CE, FCC, RoHS |
| Warranty | 2-Year Limited Warranty |
| Application | Industrial automation, POS, SCADA, test equipment |
| Country of Origin | Made by Black Box |

All packages are shipped same day if the order is placed before 3PM CST
We use UPS/FedEx to ship the packages with different service levels offered by UPS/FedEx
Overnight Shipping take 1 business day
Expedited Shipping take about 2-3 business days
Ground shipping take about 3-5 business days
You can select the desired service level at Checkout and we will make sure the package is shipped as per the selected service level.
We Accept
i) PayPal
ii) All Credit & Debit Cards
iii) Purchase Orders
iv) Check
v) Bank Transfer/ACH/Wire Transfer
To process the order through Paypal/CC, you can simply checkout and process the payment.
If you want to issue us Purchase Order/Check/Bank Transfer, Please contact us at the following details
Call: 469.458.9636
Email: sales@dcsupplies.net
If you have any queries, please contact us at the following details and we will be happy to help
Call
469.458.9636
469.458.9638
Email
sales@dcsupplies.net
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Black Box SP385A-R3 USB to RS232 Opto-Isolated Media Converter
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