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Description
Black Box RS-232 to Current Loop ConverterThe Black Box RS 232 to Current Loop Converter is a versatile, bidirectional interface designed to bridge modern serial hosts with legacy analog control systems. It translates RS 232 data into a stable 20 mA current loop signal, enabling seamless communication between computers, microcontrollers, PLCs, and field devices that rely on 20 mA loops for sensing and actuating. This converter is engineered for reliability in industrial environments,
The Black Box RS-232 to Current Loop Converter is a versatile, bidirectional interface designed to bridge modern serial hosts with legacy analog control systems. It translates RS-232 data into a stable 20-mA current loop signal, enabling seamless communication between computers, microcontrollers, PLCs, and field devices that rely on 20 mA loops for sensing and actuating. This converter is engineered for reliability in industrial environments, featuring optical isolation to protect both ends of the link from electrical noise, transients, and ground loop issues. Whether you are retrofitting an older instrument panel, integrating sensors into a new control network, or expanding your data acquisition capabilities, this compact converter delivers robust performance with flexible configuration options. The device supports both active and passive current loop operation, giving you the freedom to match power availability and system architecture without changing the host or the field devices. In active mode, an RS-232 host can talk to a passive 20-mA loop device, while in passive mode, the loop supplies the necessary current without requiring an external power source for the converter itself. The combination of bidirectional data flow, isolation, and a small footprint makes the Black Box converter an efficient, cost-effective solution for industrial automation, process control, and instrumentation projects where space and reliability matter. Its straightforward wiring and compatibility with standard RS-232 interfaces simplify installation, minimize downtime, and help ensure consistent, error-free communication across long cable runs and electrically noisy environments.
- Bi-directional communication - Enables two-way data exchange between RS-232 hosts and 20-mA current loop devices for responsive control and monitoring.
- Configurable operation - Choose active or passive current loop mode to accommodate different power sources and device requirements.
- Optical isolation - Provides electrical isolation between the RS-232 side and the current loop side to protect equipment and reduce ground loop noise.
- Compact, rugged design - Small form factor designed for panel mounting or tight enclosures in industrial settings.
- Easy integration - Simple wiring to standard RS-232 interfaces and current loop devices, enabling rapid deployment and minimal downtime.
Technical Details of Black Box RS-232 to Current Loop Converter
- Interface: RS-232 on the host side; 20-mA current loop on the field side
- Operating modes: Active or Passive current loop configuration
- Isolation: Optical isolation between RS-232 and current loop
- Power: Optional power for active mode; passive mode relies on current from the loop
- Connectivity: Compact package suitable for panel mounting or DIN rail enclosure
- Environment: Built to withstand typical industrial conditions while keeping signal integrity high
How to install Black Box RS-232 to Current Loop Converter
- Power off all equipment before making connections to prevent data errors or damage.
- Connect the RS-232 host device to the converter’s RS-232 port using a standard serial cable that matches your device’s port configuration (null modem or straight-through as required).
- Configure the converter to the desired mode (Active or Passive current loop) according to your system architecture. If you are unsure, start with the option that provides external power for the loop and verify operation.
- Attach the 20-mA current loop wiring to the field device(s). Confirm correct polarity and ensure loop integrity to avoid voltage drops that could affect signal levels.
- Power on the system and perform a functional test by sending representative commands from the RS-232 host and verifying that the field devices respond with the expected current loop behavior and feedback.
Frequently asked questions
- What is the Black Box RS-232 to Current Loop Converter? It is a bidirectional interface that translates RS-232 serial data into a 20-mA current loop signal, with optical isolation and configurable operation to suit different installation scenarios.
- Do I need power for active mode? Yes. If you select active current loop mode, a power source is required to drive the loop. In passive mode, the current loop itself provides the necessary power, and the converter relies on that supply.
- What does optical isolation protect? Optical isolation electrically separates the RS-232 side from the current loop side, reducing the risk of ground loops, voltage transients, and interference propagating between the host and field equipment.
- Is it compatible with standard RS-232 devices? Yes. The converter is designed to work with typical RS-232 serial hosts and 20-mA current loop field devices, enabling straightforward integration into existing setups.
- Can it handle bidirectional communication? Absolutely. The device supports bidirectional data transfer, allowing commands and telemetry to flow in both directions between the host and field devices.
Shipping Notes
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.3 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 3
Works well but takes up more space than expected
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
This room divider does the job for creating a little extra privacy and was easy enough to set up. The panels feel decent quality and the wider feet help keep it more stable than some cheaper screens I’ve tried. My only issue is that it takes up a bit more room than I expected, especially with the feet sticking out. It’s still portable and folds away nicely, but definitely measure your space first. Overall it works well for separating a room or blocking off an area temporarily. i wish it came in other colors
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Nice divider, serves it's purpose well!
Size: 3 Panel 12FT W
This room divider worked out very well for what I needed. I wanted a simple way to create a little more privacy and separation in a larger room without doing anything permanent, and this divider was an easy solution. The panels provide good coverage, and the black color gives it a clean, modern appearance that blends in nicely with different décor styles.
Assembly was fairly straightforward, and once set up, the wider feet helped keep the divider stable on the floor. I was especially happy with how flexible the panels are to arrange. You can keep it mostly straight, angle it around furniture, or create a more enclosed private space depending on the layout you need.
The material allows light to filter through slightly while still offering a noticeable sense of privacy. I’ve used it for separating a workspace area, but it would also work well in bedrooms, apartments, dorms, studios, or shared living spaces. Another plus is that it can be folded and moved without too much effort when you want to change the setup.
Overall, this divider delivers a good balance of functionality, portability, and appearance. It’s a practical option for anyone needing temporary room separation without installing permanent walls or curtains.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Perfect for Adding Privacy to a Piano Studio
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
I Ordered the 2 Panel version which is way too big for my needs... that's on me. So keep in mind that the picture shows a fabric made for two panels only being used on one and hence it is not pulled tight; it would pull tight and not be so wrinkly if it was set up properly as two panels. The metal pools that make up the panels seem to be well made, stable, and of good quality. They were very easy to put together and they stand up tall with plenty of height. The appearance of it with the fabric on it isn't as elegant as it could be, but it still looks good enough. The material is plenty solid, not allowing light through it, and thereby making a solid barrier. I am using it to block the view out the studio door when a student is sitting at the piano to avoid distractions from the hallway. It will allow a student to enter the studio with our distracting the student who is at the piano.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Room Divider That Gives Instant “This Is a Separate Space Now” Energy
Size: 3 Panel 12FT W
The Siebwin 3 Panel Folding Privacy Screen is surprisingly effective at changing the feel of a room without requiring construction, commitment, or somebody yelling about load bearing walls. The 12 foot width gives a substantial amount of coverage, making it useful for creating privacy, dividing open areas, blocking visual clutter, or setting up temporary sections within larger rooms. This saved us a ton of time and money in our new studio and enabled us to create a kitchen and office in one room.
The wider feet make a huge difference because flimsy room dividers that collapse every time someone exhales too aggressively are deeply annoying. This one feels more stable and grounded once positioned. The folding design makes it easy to move around or adjust depending on the space, and it folds down relatively compactly when not in use. It is basically the introvert curtain wall of dreams.
The material has a clean, neutral look that blends well into different room styles without screaming “temporary office cubicle panic.” It works well for apartments, studios, shared spaces, dressing areas, or simply hiding the mountain of chaos you swear you are going to organize tomorrow. Practical, portable, and refreshingly easy to use without turning setup into a three hour emotional event.
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Reviewed in the United States on May 16, 2026
★★★★★ 4
It's 2 panels holding 1 big privacy screen. Can't use as 2 separate 4' panels, but works great.
Size: 2 Panel 8FT W
This 2 panel privacy screen works well. Assembly was very straight forward, with easily labeled tubes. My son and I had it together in about 10 minutes, which was probably 3 minutes of me telling him to quit playing around and hand me the parts. It feels very sturdy, not likely to fall over or anything. The material fits well, with the Velcro being very strong. Measurements are all very accurate, with all pieces attaching properly. We have a similar privacy screen at work that we have to try and stretch out because the top and bottom Velcro doesn't fit quite right... this model does not have any issues though. The material is thin and light weight, but solid black so that you can't see anything through or behind it. I definitely think it's a great deal for the money.
What I think would have given it 5 stars though, is if you had 2 totally separate 4' panels instead of 2 panels with one big screen. It really wouldn't cost any extra to make it so that the screen was in 2 pieces and you could use it as 2 separate panels instead of having to use it as one big panel. It says 2 panel folding privacy screens, but it's really one big one that folds in the middle.
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Reviewed in the United States on May 25, 2026