{"product_id":"dc-12v-1-channel-rs232-db9-time-delay-relay-board","title":"DC 12V RS232 Serial Time Delay Relay Board – DB9 1-Channel","description":"\n\u003ch2\u003eDC 12V 1-Channel RS232\/UART Time Delay Relay Board with DB9 Serial Port\u003c\/h2\u003e\n\u003cp\u003eTake precise control of your automation projects with this compact \u003cstrong\u003eDC 12V Single-Channel Time Delay Relay Board\u003c\/strong\u003e. Featuring a standard \u003cstrong\u003eDB9 RS232 serial port\u003c\/strong\u003e, this relay module communicates via both \u003cstrong\u003eAT commands\u003c\/strong\u003e and \u003cstrong\u003e8-byte UART instructions\u003c\/strong\u003e — automatically recognized without any manual switching. Whether you're building a home automation system, industrial control panel, or embedded electronics project, this board delivers reliable, programmable switching in a minimal footprint.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Instruction Sets:\u003c\/strong\u003e Supports AT commands and 8-byte binary instructions with automatic protocol detection — no configuration needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e6 Versatile Working Modes:\u003c\/strong\u003e Open, Close, Click (momentary), Self-locking, Interlocking, and Time Delay — covering virtually every switching scenario.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended Delay Control:\u003c\/strong\u003e Under AT command mode, program delays of up to \u003cstrong\u003e9,999 seconds\u003c\/strong\u003e for precise timed automation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRS232 DB9 Connectivity:\u003c\/strong\u003e Standard DB9 serial connector makes integration with PCs, microcontrollers, and industrial equipment straightforward.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Load Capacity:\u003c\/strong\u003e Handles up to \u003cstrong\u003e10A at 250VAC \/ 30VDC\u003c\/strong\u003e, making it suitable for controlling lights, motors, solenoids, and more.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Standby Current:\u003c\/strong\u003e Only 16mA standby draw (47mA with relay energized) — efficient and ideal for always-on applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Measures just 56.5 × 31.5 × 17.5 mm and weighs 24g — easy to integrate into tight enclosures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 12V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandby Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActive Current (1 relay open)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e47mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSerial Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRS232 DB9 Port\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstruction Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAT Command \u0026amp; 8-Byte Binary (auto-detected)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOpen, Close, Click, Self-locking, Interlocking, Delay\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Delay (AT Command)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9,999 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10A \/ 250VAC · 10A \/ 125VAC · 10A \/ 30VDC · 10A \/ 28VDC · 10A \/ 12VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e56.5 × 31.5 × 17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× DC 12V 1-Channel Time Delay Relay Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafety \u0026amp; Compliance\u003c\/h3\u003e\n\u003cp\u003eThis board operates at low voltage (DC 12V) and falls within EU LVD low-voltage thresholds (below 50VAC \/ 75VDC). Always follow proper electrical safety practices when connecting relay outputs to mains voltage loads. For electrical safety guidelines, refer to \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety Standards\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to monitor color settings, actual product color may vary slightly from images.\u003c\/li\u003e\n  \u003cli\u003ePlease allow ±1–3 cm variance due to manual measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What serial communication protocols does this relay board support?\u003c\/h4\u003e\n\u003cp\u003eA: This relay board supports both \u003cstrong\u003eAT commands\u003c\/strong\u003e and \u003cstrong\u003e8-byte binary UART instructions\u003c\/strong\u003e over an RS232 DB9 serial interface. The board automatically detects which protocol you're using — no manual switching or configuration is required, making it highly flexible for integration with PCs, PLCs, or microcontrollers.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum time delay this relay board can be programmed for?\u003c\/h4\u003e\n\u003cp\u003eA: When using AT command mode, the board supports a maximum programmable delay of \u003cstrong\u003e9,999 seconds\u003c\/strong\u003e (approximately 2.78 hours). Note that the 8-byte binary instruction mode does not include a delay mode, so use AT commands for timed switching applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What loads can I safely connect to this relay board?\u003c\/h4\u003e\n\u003cp\u003eA: The onboard relay is rated for a maximum load of \u003cstrong\u003e10A at 250VAC, 10A at 30VDC\u003c\/strong\u003e, and several intermediate ratings. This makes it suitable for switching lights, small motors, solenoid valves, fans, and other resistive or inductive loads within these limits. Always follow appropriate electrical safety practices and use proper wiring for the connected load.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What working modes are available on this relay board?\u003c\/h4\u003e\n\u003cp\u003eA: The board offers \u003cstrong\u003e6 working modes\u003c\/strong\u003e: Open (normally open), Close (normally closed), Click (momentary toggle), Self-locking (latching), Interlocking, and Time Delay. This versatility covers a wide range of automation and control use cases.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What serial communication protocols does this relay board support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This relay board supports both AT commands and 8-byte binary UART instructions over an RS232 DB9 serial interface. The board automatically detects which protocol you're using — no manual switching or configuration is required, making it highly flexible for integration with PCs, PLCs, or microcontrollers.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum time delay this relay board can be programmed for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"When using AT command mode, the board supports a maximum programmable delay of 9,999 seconds (approximately 2.78 hours). Note that the 8-byte binary instruction mode does not include a delay mode, so use AT commands for timed switching applications.\"}}, {\"@type\": \"Question\", \"name\": \"What loads can I safely connect to this relay board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The onboard relay is rated for a maximum load of 10A at 250VAC, 10A at 30VDC, and several intermediate ratings. This makes it suitable for switching lights, small motors, solenoid valves, fans, and other resistive or inductive loads within these limits. Always follow appropriate electrical safety practices and use proper wiring for the connected load.\"}}, {\"@type\": \"Question\", \"name\": \"What working modes are available on this relay board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board offers 6 working modes: Open (normally open), Close (normally closed), Click (momentary toggle), Self-locking (latching), Interlocking, and Time Delay. This versatility covers a wide range of automation and control use cases.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"DC 12V RS232 Serial Time Delay Relay Board – DB9 1-Channel\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/dc-12v-1-channel-rs232-db9-time-delay-relay-board\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"Default Title","offer_id":48749627080896,"sku":"\u003cnone\u003e","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/S5060225b5fb7432bbd47bcd68d4c6a8cU.webp?v=1786207800","url":"https:\/\/vueselect.com\/products\/dc-12v-1-channel-rs232-db9-time-delay-relay-board","provider":"Vue","version":"1.0","type":"link"}