{"product_id":"honeywell-621-9938r-redundant-serial-i-o-module-siom","title":"Honeywell 621-9938R Redundant Serial I\/O Module SIOM","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Honeywell 621-9938R is a redundant Serial I\/O Module (SIOM) used in remote serial I\/O card files. It controls the serial I\/O card file and interfaces with the 621-9939 Serial Link Module (SLM) in the processor card file, supporting dual-port redundant serial configurations.\u003c\/p\u003e\n\u003ch3\u003eKey Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: Serial I\/O Module (SIOM) – redundant version\u003c\/li\u003e\n\u003cli\u003ePorts: Dual communication ports for redundant serial links\u003c\/li\u003e\n\u003cli\u003eI\/O capacity: Supports 8 \/ 16 \/ 32-point configurations\u003c\/li\u003e\n\u003cli\u003eInterface: Connects to 621-9939 SLM\u003c\/li\u003e\n\u003cli\u003eSystem: Honeywell IPC \/ ISSC 600 and related platforms\u003c\/li\u003e\n\u003cli\u003eConfiguration: DIP-switch selectable address and options\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Choose This\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupports redundant serial I\/O architectures\u003c\/li\u003e\n\u003cli\u003eDual ports for high-availability communication\u003c\/li\u003e\n\u003cli\u003eConfigurable for different point densities\u003c\/li\u003e\n\u003cli\u003eProven module for legacy Honeywell serial I\/O systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommon Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedundant?\u003c\/strong\u003e Yes – dual-port design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairs with?\u003c\/strong\u003e 621-9939 Serial Link Module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint options?\u003c\/strong\u003e 8, 16 or 32 points.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMounting Steps\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInstall the module in slot N of the remote serial I\/O card file.\u003c\/li\u003e\n\u003cli\u003eSet DIP switches for starting address and I\/O configuration.\u003c\/li\u003e\n\u003cli\u003eConnect the dual serial links and install terminating resistors at the ends of the network.\u003c\/li\u003e\n\u003cli\u003ePower up and verify communication with the SLM.\u003c\/li\u003e\n\u003cli\u003eConfirm I\/O point mapping in the control system.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eBuying Advice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRequired for redundant serial I\/O card files.\u003c\/li\u003e\n\u003cli\u003eEnsure matching terminating resistors are installed.\u003c\/li\u003e\n\u003cli\u003eCritical spare for dual-redundant serial I\/O systems.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":50167224729738,"sku":"621-9938R","price":182.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/2818\/2154\/files\/621-9938R_2_214387dc-de0b-46d0-a72a-fcedbfefc517.jpg?v=1788944919","url":"https:\/\/www.cambiaplc.com\/products\/honeywell-621-9938r-redundant-serial-i-o-module-siom","provider":"Controlix Automation","version":"1.0","type":"link"}