When you're tying a serial device into a fieldbus network, the gateway is the linchpin. One of the first decisions is port count, and the Moxa MGATE 4101-MB-PBS offers a single port. That's a solid match for straightforward point-to-point integration, but it's not the only detail to weigh. Priced at USD 969.00, this open-box unit from Moxa brings a specific set of specs: 12-48 VDC power input, RS-232/422/485 serial support, and a 1-port fieldbus interface.
Quick verdict
If your application needs exactly one serial device bridged to a fieldbus network, the MGATE 4101-MB-PBS is a practical candidate. The wide 12-48VDC input range gives flexibility for industrial power supplies, and the RS-232/422/485 serial options cover common legacy devices. The catch: the unit is open box, so you're trading a pristine retail package for a lower listed price.
Who it suits
This gateway works best for engineers and integrators who need a single-port fieldbus connection and already know their serial device speaks RS-232, RS-422, or RS-485. It's also suited to setups where the DC supply may vary, since the 12-48VDC range accommodates common industrial voltages without needing a separate converter.
What stands out from the listed details
- 1-port design: The MGATE 4101-MB-PBS is deliberately built for one fieldbus connection, which simplifies configuration and avoids unused extra ports.
- Serial flexibility: RS-232, RS-422, and RS-485 all appear in the description, making it easier to match different serial equipment.
- Wide power input: The 12-48VDC span is useful for installations with fluctuating supply voltages or for using existing DC rails.
- Open-box condition: The listing clearly marks it as "Opened" and the attributes show "Open box." That's the main caveat-it's not a factory-sealed unit.
Meaningful trade-offs
The biggest trade-off is the open-box factor. While the price of USD 969.00 reflects that status, you won't get the same assurance as a brand-new, sealed unit. That's worth factoring into your procurement process. Also, the 1-port limitation means you can't connect multiple serial devices through this single gateway. If your network requires two or more fieldbus nodes, you'd need additional units or a different model.
Another point: the title says "Fieldbus Gateway" while an attribute categorizes it as "Network Switches." That's a minor mismatch, but the product name itself is consistent with a fieldbus gateway, so I'd treat that as a listing quirk rather than a defining feature.
Product note
MGATE 4101-MB-PBS | Moxa | Fieldbus Gateway, 1-Port, Opened
This is the product you're evaluating. It's a Moxa fieldbus gateway with one port, powered by 12-48VDC, and offering RS-232/422/485. The price is USD 969.00. The merchant description also mentions that 4D Controls has been supplying automation and electrical equipment since 2005.
For a single-port serial-to-fieldbus bridge, this unit brings the essential features. The wide power range is a clear plus, and the serial interface options give you connectivity choices. But because it's open box, make sure that's acceptable for your quality standards. If the application is a lab setup, a spares bench, or a non-critical line, that may be perfectly fine. For mission-critical installations, you might prefer a sealed unit.
Bottom line
The Moxa MGATE 4101-MB-PBS is a straightforward 1-port fieldbus gateway with flexible serial support and a useful 12-48VDC input range. At USD 969.00, the open-box condition is the main thing to weigh. If you can accept that and you need exactly one port, it's a reasonable option to consider. If you require multiple ports or a factory-sealed package, this listing probably isn't the right fit.
