Modbus RTU Servers to BACnet/IP Servers Protocol Gateway
The easiest way to connect Modbus RTU and BACnet/IP field devices. The 460MMBC gateway allows you to move automation data between up to 32 Modbus RTU servers (slaves) and up to 32 BACnet/IP server devices.
460MMBC
Price range: $896.72 through $1,035.00
Connect Your Serial Modbus Devices to Your Modern BACnet Field Devices

The 460MMBC moves automation data between up to 32 Modbus RTU server (slave) devices and up to 32 BACnet/IP devices. It serves as an ideal solution for integrating low-cost Modbus field devices (e.g., power meters, VFDs, I/O blocks, etc.) into your BACnet/IP building automation network without requiring a supervisory controller to exchange the data.
How Does the 460MMBC Protocol Gateway Move Data in My Application?
For most applications, the data mapping is very straight forward:
- Modbus register data is mapped to BACnet Analog Inputs (AI) and Analog outputs (AO)
- Modbus coil data is mapped to BACnet Binary Inputs (BI) and Binary Outputs (BO)
The only additional piece of information required for BACnet is adding metadata, which is nothing more than an ASCII description of each object. No other deep understanding of either protocol is required to configure the gateway. It really is that simple.
Need to modify your data as it passes from one protocol to the other? No problem. Each data mapping you apply can be modified with up to three mathematical functions. This allows you to manipulate values within the gateway itself before data reaches its destination.
Not exactly what you were looking for? Real Time Automation offers a full line of Modbus RTU protocol gateways and BACnet/IP protocol gateways.
Simplify Device Connectivity with Modbus Device Templates
Configuring your RTA Modbus RTU Servers to BACnet/IP Servers protocol gateway is as easy as loading a file!
Real Time Automation provides over 400 pre-defined Modbus device profiles from over 70 vendors. All you need to do is assign the IP and serial network settings, upload the template file and the gateway automatically populates the entire Modbus data point list and sets up the corresponding BACnet points. It’s that easy!
- No manual entry of Modbus registers or data mapping to BACnet objects
- Customizable tag names to fit your existing naming conventions
Why Trust Real Time Automation As Your Protocol Partner?
While there are certainly other companies offering protocol gateways, no one provides the level of support and service that you receive from Real Time Automation.
- Total protocol lifecycle support
- Talk to a live person from our Wisconsin-based headquarters every time you call
- Receive honest answers and recommendations from our sales team
- Get live Enginerd support that provides timely issue resolution without opening tickets or 24-hour wait times
460MMBC Frequently Asked Questions
The 460MMBC is available in a variety of platform options to meet your unique application needs. Use the platform comparison table to determine the right platform for you.
Purchases can be made through authorized RTA distributors or directly from Real Time Automation. Orders may be submitted by emailing a purchase order to orders@rtautomation.com or by purchasing directly on the RTA website with a credit card.
The 460MMBC is delivered with a 5-year warranty.
RTA offers multiple support options. Live Enginerd support is available from 8am to 5pm CST. Call 800-249-1612, email support@rtautomation.com or visit the support page.
Modbus RTU Client Features
Modbus Operation Modes: Modbus RTU ClientFunction Codes Supported: 1, 2, 3, 4, 5, 6, 15 & 16
Swapping: Byte and Word Swapping
Maximum Modbus RTU Client Devices: 32
Number Read/Write Scan Lines per RTU Server Device: 200 Total - 100 reads & 100 writes
Scan Line Support: Up to 125 Registers or 512 Coils
BACnet/IP Client Features
BACnet/IP Operation Modes: BACnet/IP ClientSupported Object Types: Device, BI/BO/BV, AI/AO/AV, MI/MO/MV, Character String Value
Supported Service Codes: Read Property-A, Read Property Multiple-A, Write Property-A, Write Property Multiple-A, Device Dynamic Binding-A
Maximum Connections: 32
Number Read/Write Scan Lines per Device: 200 Total - 100 reads and 100 writes
Scan Line Support: Up to 128 Objects
What our Customers are Saying
“I challenged a customer to get it working by the time I got back from his break room with a Coke and he indeed had it working when I got back. He then said, "It’s worth twice the price!"”
Eric P. / Kendall Electric
“Everything seems to be working as we imagined. Thanks for the great response time. I did not see any way to save the configuration other than screen shots, but the configuration did not get lost in the update. Thanks again, and you were a pleasure to work with.”
Kevin L. / Extol, Inc.



