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Babel Buster SPX-B BACnet IP to Modbus RTU and TCP Gateway
Babel Buster SPX-B BACnet IP to Modbus Gateway is a BACnet IP client & server with a Modbus RTU master and slave, plus Modbus TCP client and server, for connecting Modbus devices to a BACnet IP network or vice versa.

Babel Buster SPX-B BACnet IP to Modbus RTU and TCP Gateway

Your Price: $419.00
Retail Price:$524.00
Your Savings:$105.00(20%)
Part Number:BBSPX-B

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Babel Buster SPX-B contains three different clients and three different servers. The SPX-B includes BACnet/IP client and server, Modbus TCP client and server (master and slave), and Modbus RTU master and slave.

The BACnet IP client allows BACnet IP devices to be accessible from Modbus TCP or RTU. You configure the device instance, object type and instance, and poll interval for reading or writing BACnet objects. The object data is stored in the IP/XM server for subsequent retrieval by any supported remote client (or master).




A large number of BACnet objects gives you flexibility in mapping Modbus registers to any combination of BACnet objects. Packed Modbus registers may be parsed to multiple BACnet objects when reading. Multiple BACnet objects may be packed into a single Modbus register when writing. All standard Modbus register types are supported.

SPX-B2 adds an SNMP client and server. The SNMP client allows SNMP devices to be accessible from BACnet IP or Modbus. You configure the SNMP agent's IP address, the OID of the MIB variable you wish to poll, and set a polling interval. The object data is stored in the SPX-B server for subsequent retrieval by any supported remote client.

Value objects will poll their assigned Modbus register at the interval you specify. The content of the Modbus register will be given as the Present Value of the BACnet object when read. The Modbus register is written each time the BACnet Value object is written. The Value object corresponds well with the Modbus Holding register.

Input objects will poll their assigned Modbus register at the interval you specify, and provide the Modbus data as the Present Value when read. Commandable Output objects are used to write Modbus registers, and will update the Modbus device each time BACnet is updated.

The same polling schemes that apply to Modbus also apply to remote BACnet IP slaves polled by the SPX-B's BACnet IP client, and apply to SNMP or WiFi sensor polling as applicable.

• Universal, fully configurable
• No extra software or drivers to buy


• Read/Write any standard Modbus register via BACnet
• Read/Write any standard BACnet object via Modbus
• Bidirectional communication between BACnet and Modbus
• Supports Modbus “coils”, input registers, holding registers
• Single or double Modbus registers
• Signed, unsigned, IEEE 754
• Modbus register mapping configured via web interface
• Modbus registers may be scaled (x10, x0.1, etc.)
• Modbus (master) polling interval configurable per point
• Commandable BACnet objects implement priority array
• Hardened EIA-485 transceiver for Modbus RTU
• 10/100BaseT Ethernet for BACnet IP and Modbus TCP
• Powered by 10-30VDC or 12-24VAC 50/60 Hz
• Power Consumption: 0.1A @ 24VDC
• Panel mount, 70mm H x 131mm W x 38mm D
• Pluggable screw terminal block for power & RTU network
• Operating temperature -40°C to +85°C
• Humidity 5% to 90%
• FCC Class A, CE Mark