{"product_id":"allen-bradley-1785-ke-data-highway-plus-interface-module","title":"Allen-Bradley 1785-KE Data Highway Plus Interface Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1785-KE\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1785-KE\u003c\/strong\u003e Data Highway Plus Interface Module, operates as a dedicated hardware component for protocol conversion and serial communication bridging within Allen-Bradley PLC-5 platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1785-KE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.04 lbs (1.38 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 1771 Single-Slot Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C (32 to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eStandard 1771 Backplane Draw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC (Backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interfaces\u003c\/td\u003e\n\u003ctd\u003e1 DH+ Channel, 1 RS-232-C \/ RS-422-A Serial Port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rates\u003c\/td\u003e\n\u003ctd\u003e57.6 kbps (DH+), Up to 19.2 kbps (Serial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Topology\u003c\/td\u003e\n\u003ctd\u003eDH+ Trunkline \/ Drop Line, Point-to-Point Serial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003ePLC-5 \/ 1771 I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e1771 Universal I\/O Chassis Slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Backplane Bus \u0026amp; Network Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1785-KE resides within a standard 1771 I\/O chassis, interfacing via the backplane bus to bridge asynchronous RS-232-C or RS-422-A serial protocols directly into a Data Highway Plus (DH+) deterministic network. Operating as an intelligent interface module, it offloads protocol encapsulation and buffer management from the primary PLC-5 processor, enabling programming terminals, operator interfaces, and industrial computers to execute data exchanges across the DH+ network at 57.6 kbps. Galvanic isolation on the serial interface prevents ground potential differences from interfering with backplane signal integrity.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the primary function of the 1785-KE interface module in a PLC-5 system?\u003c\/p\u003e\n\u003cp\u003eA: The 1785-KE acts as a physical and protocol bridge, allowing host computers, programming devices, or HMIs with RS-232-C or RS-422-A serial ports to communicate directly with controllers on a Data Highway Plus (DH+) network.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1785-KE module require external power wiring?\u003c\/p\u003e\n\u003cp\u003eA: No, the 1785-KE receives its primary logic power directly from the 1771 chassis backplane bus at 5 VDC, eliminating the need for external power supply wiring to the module card.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Isolation\u003c\/strong\u003e: Disconnect primary AC power from the 1771 chassis power supply before inserting or removing the 1785-KE module to protect backplane bus connectors from transient arcing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Mounting\u003c\/strong\u003e: Align the module card edges with the top and bottom guides of the selected slot in the 1771 Universal I\/O chassis. Slide the unit in until it seats firmly into the backplane, then lock the chassis retaining latch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Port Wiring\u003c\/strong\u003e: Connect serial cabling using shielded, twisted-pair conductors for RS-232-C or RS-422-A lines. Ensure cable runs do not exceed standard EIA length limits (50 feet for RS-232-C) to prevent data corruption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDH+ Cable Termination\u003c\/strong\u003e: Connect DH+ twinaxial cable to the module terminal block or 9-pin connector. Install proper 82-ohm terminating resistors at both physical endpoints of the DH+ trunkline.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding\u003c\/strong\u003e: Terminate overall cable shields strictly at a single point on the main chassis ground bus to mitigate EMI noise without creating ground loops.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48770299953342,"sku":"1785-KE","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1785-KE_3_05b45f97-0bf4-458a-8366-9656e1bed6d1.png?v=1787296698","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1785-ke-data-highway-plus-interface-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}