Honeywell 51400700-100 DHI - Data Hiway Interface card for the Hiway Gateway provides the link between the Data Hiway and the Local Control Network (LCN). This DHI card in a 5-slot or dual-node chassis, along with the DHI I/O card and processor card, makes up the Hiway Gateway.

The Hiway Gateway provides the data conversion, buffering, and sequencing necessary to provide an efficient interchange of information between the Local Control Network and the Data Hiway. Although the Local Control Network and the Data Hiway use similar dual coaxial cables and bit-serial communications, they have different communication protocols because of the type of information they carry. This conversion of protocols and communication speeds is necessary to link the short distance, high-speed communications typical of LCN based modules with the widely dispersed, short-message, and less-rapid communications that are characteristic of Data Hiway based devices.

Functions:
? Provides secure communication link between the TDC 3000 Local Control Network and the Data Hiway.
? Converts data and protocol between the Local Control Network and the Data Hiway.
? Provides hiway polling if the Data Hiway has a single branch and there are no other preferred-access devices on the hiway.
? Scans the hiway for alarm conditions.
? Synchronizes time-keeping for hiway-based process connected devices.

DHI I/O Non-CE board DHI I/O
DHI I/O CE board DHI I/O CE