{"product_id":"allen-bradley-1769-ascii-dual-port-ascii-communication","title":"Allen-Bradley 1769-ASCII | Dual Port ASCII Communication","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Allen-Bradley \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e is a high-performance, dual-port serial communication module designed for the CompactLogix and MicroLogix 1500 platforms. This module enables seamless integration between your PLC and various ASCII-based devices, such as barcode scanners, weigh scales, serial printers, and legacy sensors. \u003c\/p\u003e\n\u003ch2\u003eTechnical Configuration \u0026amp; Hardware Architecture\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e features a sophisticated hardware design that prioritizes signal purity and multi-protocol flexibility. It functions as an intelligent I\/O module that resides directly on the 1769 backplane.\u003c\/p\u003e\n\u003ch3\u003eDual Isolated Port Topology\u003c\/h3\u003e\n\u003cp\u003eEach port on the \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e is electronically isolated to 30V continuous, protecting the backplane from ground loops and induced noise common in long-run serial cabling. Port 1 is optimized for RS-232 and RS-422 full-duplex communication, while Port 2 provides robust RS-485 multi-drop capabilities, allowing for versatile field device networking.\u003c\/p\u003e\n\u003ch3\u003eBackplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe module draws its 425mA operating current directly from the 5V DC backplane, simplifying enclosure wiring by eliminating the need for external power supplies. This hardware-level integration ensures that the communication ports are synchronized with the controller's internal clock for precise data time-stamping.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"padding: 8px; background-color: #f2f2f2; text-align: left;\"\u003eFeature\u003c\/th\u003e\n\u003cth style=\"padding: 8px; background-color: #f2f2f2; text-align: left;\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModel Number\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eNumber of Ports\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e2 Isolated Ports (DB-9 Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eProtocols Supported\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eRS-232, RS-422, RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eMax Baud Rate\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e115.2 kbps per port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e425mA @ 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e0°C to 60°C (32°F to 140°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e30V continuous (710V DC for 1s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eInstallation \u0026amp; Engineering Guide\u003c\/h2\u003e\n\u003cp\u003eTo ensure optimal performance of the \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e, engineers must adhere to specific mechanical and electrical placement rules.\u003c\/p\u003e\n\u003ch3\u003ePower Supply Distance Rating\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e has a power supply distance rating of 4. This means the module must be installed within four slots of the 1769 system power supply to ensure it receives consistent, regulated voltage for its dual-port circuitry.\u003c\/p\u003e\n\u003ch3\u003eCabling and Grounding\u003c\/h3\u003e\n\u003cp\u003eFor high-reliability data transmission, use high-quality shielded twisted-pair cabling (such as Belden 8761). Proper termination of the cable shield at the chassis ground is essential to minimize the impact of EMI on the ASCII string data, especially when operating at the maximum baud rate of 115.2 kbps.\u003c\/p\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimultaneous Communication:\u003c\/strong\u003e Both ports operate independently, allowing the system to read from a barcode scanner on Port 1 while sending data to a printer on Port 2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtocol Versatility:\u003c\/strong\u003e Native support for multiple RS-standards allows for easy retrofitting of legacy factory equipment into modern ControlLogix-based architectures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Industrial Design:\u003c\/strong\u003e Capable of operating in high-temperature environments (up to 60°C) without the need for active cooling, provided that the 50mm clearance rule is followed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: Does the \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e support Modbus RTU?\u003c\/strong\u003e\u003cbr\u003eA1: While the module is hardware-capable of RS-485, it is primarily designed for raw ASCII string communication. Implementing Modbus RTU requires manual ladder logic programming to handle the Modbus frame and CRC checks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Can I mix RS-232 and RS-485 on the same module?\u003c\/strong\u003e\u003cbr\u003eA2: Yes. The \u003cstrong style=\"color: #003366;\"\u003e1769-ASCII\u003c\/strong\u003e ports are independent. You can configure Port 1 for RS-232 communication with a PC and Port 2 for an RS-485 network of sensors simultaneously.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Is external power required for the serial signal?\u003c\/strong\u003e\u003cbr\u003eA3: No. The module generates the necessary signal voltages internally from the 5V backplane power. However, the connected device must provide its own power source for its communication interface.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51050303783044,"sku":"1769-ASCII","price":158.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/7454\/7844\/files\/1769-ASCII-1.jpg?v=1776586670","url":"https:\/\/www.etowonauto.com\/nb\/products\/allen-bradley-1769-ascii-dual-port-ascii-communication","provider":"Etowon Auto","version":"1.0","type":"link"}