{"product_id":"1769-ascii-allen-bradley-compactlogix-ascii-module-1769-ascii-interface","title":"1769-ASCII Allen-Bradley CompactLogix ASCII Module 1769-ASCII Interface","description":"\u003ch2\u003eAllen-Bradley 1769-ASCII CompactLogix Interface Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1769-ASCII\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1769-ASCII\u003c\/strong\u003e Communication Module, operates as a dedicated hardware component for serial ASCII protocol execution within CompactLogix 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\u003e1769-ASCII\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\u003e0.90 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.5 cm x 13.17 cm x 8.7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to +62 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.13 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSpecialty Communication Interface Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e425 mA @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Channels\u003c\/td\u003e\n\u003ctd\u003e2 Independent DB-9 male ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Layer Protocols\u003c\/td\u003e\n\u003ctd\u003eRS-232, RS-422, RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e30 V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Distance Rating\u003c\/td\u003e\n\u003ctd\u003e4 modules from power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication and Serial Network Expansion\u003c\/h3\u003e\n\u003cp\u003eEngineers integrate the 1769-ASCII module into CompactLogix or MicroLogix 1500 system racks to bridge serial devices with controller logic over the backplane bus. The module processes full-duplex RS-232\/RS-422 and half-duplex RS-485 protocols across two independently configurable channels, which prevents data bottlenecks during simultaneous transmit and receive cycles. Furthermore, onboard buffer management handles TX\/RX FIFO queues to mitigate overflow errors, while continuous 30 V isolation protects controller backplane logic from ground loops and field-side electrical noise.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does backplane current draw limit the placement of the 1769-ASCII module?\u003c\/p\u003e\n\u003cp\u003eA: The module draws 425 mA at 5 VDC directly from the CompactLogix backplane, requiring installation within a power supply distance rating of four modules to maintain bus rail stability.\u003c\/p\u003e\n\u003cp\u003eQ: How do technicians verify communication status and diagnose channel framing errors?\u003c\/p\u003e\n\u003cp\u003eA: Diagnostic status bits report TX\/RX FIFO overflows, parity errors, and handshake faults directly to controller tags, while LED indicators provide visual feedback for active port activity.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eTechnicians must verify that main system rack power remains off before inserting or removing the 1769-ASCII module. Align the module tongue-and-groove slots with the adjacent Compact I\/O module, sliding the unit until the backplane bus connectors interlock completely. Secure the panel-mounting feet or DIN-rail latch to establish chassis ground continuity through the mounting assembly.\u003c\/p\u003e\n\u003cp\u003eRoute serial communications wiring using Belden 8761 shielded cable, keeping signal conductors separated from high-voltage AC lines inside cabinet wire ducts. Connect cable shields directly to dedicated earth ground points to suppress electromagnetic interference, and ensure field cables do not exceed maximum RS-232 or RS-485 length specifications. Maintain adequate ventilation clearance around module cooling vents to ensure continuous convective heat dissipation.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52918077587768,"sku":"1769-ASCII","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/308..jpg?v=1788760192","url":"https:\/\/www.automodulexpert.com\/products\/1769-ascii-allen-bradley-compactlogix-ascii-module-1769-ascii-interface","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}