a-Bb 691ht Hart Modem for PC Software Communication

• Customization: Available
• After-sales Service: 1 Year
• Warranty: 1 Year
• Model NO.: A-BB 691HT Modem
• Place of Origin: Italy
• Brand Name: a-Bb
• Model Number: 691 Ht
• Application: Widely
• Power: USB-Powered
• LED Ind.: Status
• Conn.: 4mm Terminals
• Range: up to 500m
• Load Res.: 250+ Ohm
• Protection: Short-Circuit
• Temp.: -20°C to +70°C
• Humidity: 90% Non-Cond.
• Certif.: CE, RoHS
• Sw Req.: Hart APP
• Mounting: DIN Rail
• Transport Package: Original
• Specification: 10*20*20cm
• Trademark: A-BB
• Origin: Italy
• HS Code: 8517623400
• Production Capacity: 500piece/Year
• Package Size: 10.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 1.500kg

Product Description

Product Description

Type	HART Modem
Use	PC-based comm
Interface	USB
Protocol	HART (FSK)

1. The Industrial Communication Landscape: The Role of HART and the Need for Reliable Connectivity

Modern process industries rely heavily on intelligent field devices – transmitters, actuators, valve positioners – equipped with the HART (Highway Addressable Remote Transducer) protocol. HART overlays digital diagnostic, configuration, and calibration data onto the industry-standard 4-20mA analog signal, creating a powerful "two-wires, two signals" foundation for smarter asset management and process optimization. However, harnessing this wealth of digital intelligence requires a robust, reliable communication bridge between these field devices and the PCs running critical software applications: engineering tools for configuration and commissioning (like FieldComm Group's DTM tools or device-specific software), asset management systems for condition monitoring and predictive maintenance, calibration systems, and data historians. This is where specialized HART modems become indispensable. They physically translate the FSK (Frequency Shift Keying) HART signal superimposed on the loop current into a form (typically serial, USB, or Ethernet) understandable by a PC. The A-BB 691HT HART Modem is engineered specifically to fulfill this role, providing a dependable, certified pathway for accessing the critical data residing in HART-enabled devices from virtually any PC-based application.

2. Technical Design and Core Capabilities of the 691HT Modem

The A-BB 691HT is a purpose-built universal HART modem designed for seamless integration into diverse industrial communication setups. Its primary interface to the HART network is via a durable, screw-terminal connection that taps into the device loop. Crucially, it features automatic communication line sensing and polarity detection, eliminating the common headaches associated with incorrect manual wiring – a significant advantage in field environments. Connectivity to the host PC is predominantly achieved through a standard USB 2.0 port (USB Type-B), leveraging the ubiquity and plug-and-play simplicity of USB connectivity. This allows users to instantly connect the modem to laptops or workstations without needing specialized serial ports or installing complex hardware drivers. Compliant with the stringent HART Physical Layer Specification Revision 9.0, the 691HT ensures compatibility with the widest range of HART devices, both older revisions and the latest capabilities. It has passed the rigorous conformance tests mandated by the FieldComm Group, receiving the official FOUNDATION™ Registration Mark, guaranteeing interoperability and adherence to global industry standards. The modem operates within a wide voltage range (10.5 – 55 Vdc), making it suitable for most common control system voltages without requiring an additional external power source when used on loops with sufficient power.

3. Operational Benefits: Simplicity, Diagnostics, and Enhanced Productivity

The fundamental value proposition of the A-BB 691HT lies in its ability to significantly enhance operational efficiency and reduce maintenance effort. Its plug-and-play USB connectivity dramatically slashes commissioning time compared to legacy solutions requiring specific COM port assignments and manual configuration. Technicians in the field or at the workbench can simply plug the modem into their laptop, connect it to the HART loop via test leads or across an integrated load resistor, and immediately start communicating with target devices using their chosen PC software. This eliminates setup delays and configuration errors.

3. Operational Benefits: Simplicity, Diagnostics, and Enhanced Productivity

The 691HT offers two operational modes: a simple "Passive Listen-Only Mode," ideal for non-intrusive monitoring and diagnostics without disrupting control, and a full "Active Mode" for bi-directional communication, supporting all standard HART commands required for configuration, calibration, and advanced diagnostics. A built-in Status LED provides immediate visual feedback on operating voltage presence, HART signal activity, and USB connectivity status, aiding rapid troubleshooting. Crucially, the modem generates a constant 250-ohm loop resistance when connected across a loop, ensuring stable HART communication conditions and accurate loop current measurements by the connected software. Its intrinsically safe models (691HT-IS) are certified for use in hazardous areas (Ex ia, Class I, Div 1), extending its applicability to the most demanding environments.

Specification

Packaging & Shipping

Company Profile

KeRui (weifang) Automation Equipment Co., Ltd. specializes in industrial automation instrument development, production and sales, technical services, and supportingequipment supply of specialized companies. The main products are flow meters, level meters, temperature meters, pressure meters, electrical meters, thermal intelligent meters, programmable controllers (PLC), DCS distributed control systems,and eight series of more than 1,000 specifications. Its products and technologies are widely used in electric power, metallurgy, petrochemicals, environmental textile, dyeing, and other fields.protection, plastics, food, printing, tobacco,textile, dyeing, and other fields.

FAQ

Q: How long will you give me the reply?
A: We will reply to you as soon as we see the information.
 
Q: What is the delivery time?
A:The products in stock will be shipped after receiving the payment, and the products that
need to be ordered are subject to the factory time.
 
Q: How about your package?
A: Do not worry about the package, we have rich experience in packing.
 
Q: How about the payment terms?
A:You can choose T/T.
 
Q: What is the MOQ?
A:1PC.
 
Q: Can l get a lower price if l order large quantities?
A: Yes, cheaper prices with more bigger size orders.
 
Q:After sales and warranty?
A: We provide one year warranty lifetime technical support services.