{"product_id":"honeywell-s7800a1142-keyboard-display-module","title":"Honeywell S7800A1142 Keyboard Display Module","description":"\u003cdiv class=\"qk-md-paragraph qk-md-has-multi-modal\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell S7800A1142\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eS7800A\u003c\/strong\u003e Keyboard Display Module, operates as a dedicated hardware component for localized diagnostic readout, parameter configuration, and status monitoring within 7800 Series burner control system networks. It establishes direct serial communications with the main burner control module to display operational timing, flame signal strength, lockout sequence cause data, and system diagnostic codes in real time.\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\u003eS7800A1142 (S7800A)\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\u003e0.32 kg (Shipping Weight: 0.80 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e127 mm x 73 mm x 22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e13 VDC @ 100 mA max (supplied by 7800 Series module)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eKeyboard Display Module (KDM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay Technology\u003c\/td\u003e\n\u003ctd\u003e2-line x 20-character vacuum fluorescent display (VFD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKeypad Interface\u003c\/td\u003e\n\u003ctd\u003e5-button membrane keypad (Scroll, Mode, Reset, Change, Enter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Protection\u003c\/td\u003e\n\u003ctd\u003eNEMA 1 \/ IP40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubsystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eHoneywell 7800 Series Relay Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol Integration and Channel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eWhile functioning as a local human-machine interface for flame safeguard controllers, the S7800A1142 operates across isolated low-voltage serial data channels. Internal optocouplers deliver galvanic isolation between the local display electronics and the high-voltage ac field terminal wiring on the host 7800 Series relay module. This prevents high-voltage ignition surges, switching noise, and common-mode transients from corrupting micro-controller memory registers. When installed in burner control cabinets alongside process control instrumentation utilizing 4-20 mA HART loop protocol communications or cold junction compensation (CJC) reference junctions for temperature loop control, the module maintains electromagnetic immunity and preserves digital data communication stability.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the S7800A1142 keyboard display module be removed or plugged in while the host relay module is powered?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module supports hot-plugging directly into the front card slot of an energized 7800 Series relay module without causing interruption to active flame monitoring operations or fault reset sequences.\u003c\/p\u003e\n\u003cp\u003eQ: How far can the S7800A1142 be remote-mounted from the main burner controller module?\u003c\/p\u003e\n\u003cp\u003eA: Remote mounting is supported up to a maximum physical cable length of 1000 feet (305 meters) using a dedicated remote mounting kit with shielded twisted-pair conductors.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePower down primary ac line power to the 7800 Series burner control enclosure if installing an optional flush-mount door frame.\u003c\/li\u003e\n\u003cli\u003eAlign the rear serial connector pins of the S7800A1142 with the front mating header socket on the 7800 Series relay module.\u003c\/li\u003e\n\u003cli\u003ePress the keyboard display module firmly into place until the top and bottom plastic locking tabs engage securely.\u003c\/li\u003e\n\u003cli\u003eFor remote door-mounting applications, ground the serial cable shield drain wire at the panel functional earth (FE) terminal block only.\u003c\/li\u003e\n\u003cli\u003eApply main power to the relay module and verify that the display initializes, showing system status and flame signal strength in millivolts.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":52703017599256,"sku":"S7800A1142","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/S7800A1142_Cocoai_1e03105c-1cf1-439a-b8d7-223e3cfd8e1b.jpg?v=1789719186","url":"https:\/\/www.innoplcsync.com\/products\/honeywell-s7800a1142-keyboard-display-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}