{"product_id":"621-9938r-honeywell-ipc-620-serial-i-o-module","title":"621-9938R Honeywell  IPC 620 Serial I\/O Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 621-621-9938R\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e621-9938R\u003c\/strong\u003e Serial I\/O Module, operates as a dedicated hardware component for controlling the serial I\/O card file and managing redundant bus communications within Honeywell IPC 620 PLC system racks. This module interfaces directly with the 621-9939 Serial Link Module (SLM) to establish fault-tolerant serial telemetry channels. Logic commands are routed across the backplane to execute high-speed serial data exchanges and maintain channel synchronization between controller racks.\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\u003e621-9938R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\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\u003e1.85 lbs (0.84 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e210 mm x 125 mm x 35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e4.2 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eSerial I\/O Interface Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture\u003c\/td\u003e\n\u003ctd\u003eRedundant Serial Communication Interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterfacing Hardware\u003c\/td\u003e\n\u003ctd\u003eHoneywell 621-9939 Serial Link Module (SLM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe 621-9938R incorporates channel-to-channel isolation barriers across its serial communication channels to prevent ground loops and protect backplane logic from line noise. Integrated galvanic isolation shields serial transmission lines against common-mode voltage surges and electro-magnetic interference generated in field conduits. This isolated architecture maintains data frame integrity during high-speed serial handshaking across primary and redundant communication links.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 621-9938R module be hot-swapped while the IPC 620 rack is powered?\u003c\/p\u003e\n\u003cp\u003eA: No. Power to the chassis must be completely shut off prior to module insertion or removal to avoid backplane communication corruption and electrical transients.\u003c\/p\u003e\n\u003cp\u003eQ: How does the 621-9938R module operate within a redundant system topology?\u003c\/p\u003e\n\u003cp\u003eA: The module manages serial bus arbitration and automatically coordinates data transfer with the secondary 621-9939 SLM interface to ensure failover continuity without signal loss.\u003c\/p\u003e\n\u003cp\u003eQ: What interface protocols are supported for serial card file control?\u003c\/p\u003e\n\u003cp\u003eA: The module executes proprietary Honeywell IPC 620 backplane serial protocols, establishing high-speed, noise-immune serial communication across local and remote rack sub-files.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect main rack power and field power sources before inserting the 621-9938R into the IPC 620 chassis slot.\u003c\/li\u003e\n\u003cli\u003eAlign the module circuit board with the top and bottom rack card guides, pushing firmly until seated into the backplane connector.\u003c\/li\u003e\n\u003cli\u003eConnect the serial interface cable to the dedicated front connector, securing thumbscrews to ensure continuous shield grounding.\u003c\/li\u003e\n\u003cli\u003eKeep serial communication cables separated from AC power conductors and high-voltage DC load wiring to reduce inductive coupling.\u003c\/li\u003e\n\u003cli\u003eGround all cable shielding to a single-point low-impedance earth ground bar at the enclosure entry point.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53620449476917,"sku":"621-9938R","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/621-9938R.png?v=1789963000","url":"https:\/\/www.5gplc.com\/products\/621-9938r-honeywell-ipc-620-serial-i-o-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}