When you are picking an industrial networking fieldbus gateway, the translator between a serial device and a PROFIBUS DP segment is what makes data move. The two options here take different approaches: the Wenglor ZAG73AN02 is a straightforward RS-232 bridge, while the Moxa MGATE 4101-MB-PBS is a broader serial gateway with multiple physical-layer options. Both are open-box fieldbus gateways, but they are not interchangeable. The right pick depends on the serial ports on your machine and how much flexibility you need downstream.
Quick Verdict
For a tightly scoped RS-232 to PROFIBUS DP job, the Wenglor ZAG73AN02 gives you the essential conversion at $361.20. It is the lower-cost way to bridge a single serial device and keep the project budget in check. For production lines with mixed serial equipment, the Moxa MGATE 4101-MB-PBS earns its $969.00 price with RS-232, RS-422, and RS-485 support plus a 12-48VDC input range that can ride on a wider control-voltage bus.
Listed Price Comparison
| Product | Listed Price | Best Fit |
| WENGLOR ZAG73AN02 FIELDBUS GATEWAY BH0229 | USD 361.20 | RS-232 to PROFIBUS DP |
| MGATE 4101-MB-PBS \| Moxa \| Fieldbus Gateway, 1-Port, Opened | USD 969.00 | 1-port serial gateway with RS-232/422/485 and 12-48VDC |
The price difference between the two is $607.80.
Where the Wenglor Wins
The Wenglor ZAG73AN02 is the lower-priced fieldbus gateway by a wide margin. It is also the simpler solution if your machine provides RS-232 and your controller expects PROFIBUS DP. That narrow focus means fewer protocol choices to configure during commissioning, and the price leaves room in the budget for cabling or a second unit.
Where the Moxa Wins
The Moxa MGATE 4101-MB-PBS is the more flexible translator. It covers RS-232, RS-422, and RS-485, so it can be reused across different serial devices rather than tied to one interface. The stated 12-48VDC supply range also makes it easier to integrate into control panels that already use a 24VDC or higher-voltage rail.
Product Notes
WENGLOR ZAG73AN02 FIELDBUS GATEWAY BH0229
Start here if you want a direct, low-cost path from an RS-232 device into PROFIBUS DP. The Wenglor gateway is the lower-priced fieldbus gateway of the two and keeps the initial spend small. As a new open-box unit, it is offered in a clean condition. The limitation is its focus: this is an RS-232 to PROFIBUS DP bridge, so plan for that one serial interface rather than expecting multi-protocol conversions. If your machine talks only RS-232, that is exactly the simplicity you want; if your panel already has other serial devices, the next product is worth the extra money.
MGATE 4101-MB-PBS | Moxa | Fieldbus Gateway, 1-Port, Opened
Choose this Moxa when the fieldbus gateway has to support more than one serial flavor. The MGATE 4101-MB-PBS is a 1-port gateway with RS-232, RS-422, and RS-485 interfaces and a 12-48VDC supply range. That combination makes it the stronger candidate for panels with mixed serial devices or where you want one gateway model that can handle different machine communications. It is an open-box unit positioned as the more flexible option. The limiting factor is the cost premium: if the only serial port on your machine is RS-232, the extra flexibility is not being used. But if you are standardizing on a gateway that can move between RS-232, RS-422, and RS-485 lines, the Moxa is the better investment.
Final Choice by Use Case
- Single RS-232 device needing PROFIBUS DP: Wenglor ZAG73AN02 FIELDBUS GATEWAY BH0229 gives you the core conversion at the lower listed price.
- Mixed serial interfaces and wider DC supply needs: MGATE 4101-MB-PBS | Moxa | Fieldbus Gateway, 1-Port, Opened offers RS-232/422/485 flexibility and a 12-48VDC input range.
