{"product_id":"16-analog-4-20-ma-outputs-raspberry-pi-back-panel","title":"16 Analog 4–20 mA Outputs for Raspberry Pi I\/O Back Panel","description":"\u003ch4 style=\"margin-top: -10px; margin-bottom: 6px;\"\u003eOverview\u003c\/h4\u003e\n\u003cp\u003eHigh-density 4–20mA analog output expansion for the Raspberry Pi I\/O Back Panel. The card provides 16 independently controlled current loop outputs routed directly to the Back Panel's terminal blocks, making it ideal for process control applications that require a large number of analog output channels in a compact, DIN-rail mounted enclosure.\u003c\/p\u003e\n\u003cul style=\"margin-top: 6px;\"\u003e\n\u003cli\u003eSixteen 14-bit 4–20mA analog outputs\u003c\/li\u003e\n\u003cli\u003eOutputs routed to Back Panel terminal blocks for clean field wiring\u003c\/li\u003e\n\u003cli\u003eOpen Drain MOSFET drivers with common ground — external 24VDC supply required\u003c\/li\u003e\n\u003cli\u003eNative RS485 \/ MODBUS RTU interface for PLC and SCADA integration\u003c\/li\u003e\n\u003cli\u003eCompatible with Command Line, Python, OpenPLC, and CODESYS\u003c\/li\u003e\n\u003cli\u003eMounts directly on the Raspberry Pi I\/O Back Panel\u003c\/li\u003e\n\u003cli\u003eAmbient operating temperature: -40°C to 85°C \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eINTERFACES AND I\/O\u003c\/h3\u003e\n\u003ctable style=\"width: auto; height: 450.8px;\"\u003e\n\u003ccolgroup\u003e \u003ccol style=\"width: 169px;\"\u003e \u003ccol style=\"width: 210px;\"\u003e \u003ccol style=\"width: 177px;\"\u003e \u003c\/colgroup\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eI\/O's\u003c\/th\u003e\n\u003cth\u003eCommunication\u003c\/th\u003e\n\u003cth\u003eSoftware Integration\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e• 16 Analog 4-20mA Outputs (source)\u003c\/td\u003e\n\u003ctd\u003e• I2C Port to Raspberry Pi\u003c\/td\u003e\n\u003ctd\u003e• Command Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• RS485\/MODBUS Port\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• Python Library\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• CAN Port\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• Node-RED nodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• CODESYS Driver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• OpenPLC Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• Home Assistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e• Arduino\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"height: 19.6px;\" colspan=\"3\"\u003eOTHER FEATURES\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• Mounts directly on the Raspberry Pi I\/O Back Panel — no additional wiring or hardware needed between card and panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• RS485 \/ MODBUS RTU port for PLC, SCADA, and HMI integration without a Raspberry Pi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• CAN \/ CANopen interface for reliable communication in industrial networks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• 16 status LEDs provide immediate visual feedback on output state\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• OLED display for real-time monitoring of output values and system status\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• PANIC input — when enabled via firmware command, an opto-isolated signal from the Back Panel triggers the local processor to set all outputs to user-defined default levels, moving connected devices to a known safe state independently of the control software\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• Stack up to 8 HOP cards of each type on the same Back Panel for high channel count applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e• ECCN classification EAR99 — no export restrictions under U.S. regulations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eDESCRIPTION\u003c\/h3\u003e\n\u003cp\u003eThe 16 Analog 4–20mA Outputs Card is part of the HOP (Hardware on Panel) family developed by Sequent Microsystems — a range of industrial I\/O expansion cards designed to mount directly on the Raspberry Pi I\/O Back Panel.\u003c\/p\u003e\n\u003cp\u003eSixteen independently controlled 4–20mA outputs are routed directly to the Back Panel's terminal blocks for clean, reliable field wiring. All outputs are source-type driven by Open Drain MOSFETs with a common ground — an external 24VDC supply is required. Each output includes automatic load interruption detection, which flags an open circuit condition if the connected receiver is disconnected or fails.\u003c\/p\u003e\n\u003cp\u003eThe card includes an opto-isolated PANIC input connected to the Back Panel's PANIC line. When enabled via firmware command, the PANIC function sets all outputs to user-defined default levels upon receiving the PANIC signal — ensuring connected devices move to a known safe state regardless of what the control software is doing.\u003c\/p\u003e\n\u003cp\u003eAn RS485 port supports MODBUS RTU communication, allowing any PLC, SCADA system, or HMI to read status and control outputs directly without a Raspberry Pi. A CAN \/ CANopen interface provides an additional communication path for industrial networks.\u003c\/p\u003e\n\u003cp\u003eEighteen LEDs provide complete visual feedback: the power LED blinks when the local processor is running, the error LED activates when the PANIC line is triggered, and sixteen output LEDs show the real-time state and configured mode of each channel. An onboard OLED display shows output values and system status at a glance.\u003c\/p\u003e\n\u003cp\u003eUp to 4 or 8 cards — depending on Back Panel version — can run on a single panel alongside one Raspberry Pi or Compute Module. Panels can be chained horizontally up to a maximum of 64 HOP cards per system, all controlled by a single Raspberry Pi running CODESYS, Node-RED, Python, or any other supported software environment.\u003c\/p\u003e\n\u003cdiv\u003e\n\u003ch3\u003eTECHNICAL DETAILS\u003c\/h3\u003e\n\u003cdiv style=\"border: 1px solid #ddd; border-radius: 4px; margin-bottom: 12px; overflow: hidden;\"\u003e\n\u003cdiv style=\"background: #e0f5f3; padding: 8px 14px; font-weight: bold; font-family: Arial, sans-serif;\"\u003eBoard Layout\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg alt=\"16 Analog 4–20 mA Outputs for Raspberry Pi I\/O Back Panel Layout\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0534\/4392\/0067\/files\/16x4-20mA-top_7ef9d2c4-21f9-4c89-99d6-352cafa50bf0_600x600.jpg?v=1774718398\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #e0f5f3; padding: 8px 14px; font-weight: bold; font-family: Arial, sans-serif;\"\u003eMechanical Dimensions\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg alt=\"16 Analog 4–20 mA Outputs for Raspberry Pi I\/O Back Panel mechanical dimensions\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0534\/4392\/0067\/files\/Mechanical_67158024-0ec3-4bb4-b799-4eb767dc8032_600x600.jpg?v=1774718646\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePOWER REQUIREMENTS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"220\" data-start=\"163\"\u003eThe card is powered via the Back Panel power connector.\u003c\/p\u003e\n\u003cul data-end=\"422\" data-start=\"221\"\u003e\n\u003cli data-end=\"315\" data-start=\"221\"\u003e\n\u003cp data-end=\"315\" data-start=\"223\"\u003eOutputs are power from the 24V supply and can draw up to 200mA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"422\" data-start=\"316\"\u003e\n\u003cp data-end=\"422\" data-start=\"318\"\u003eThe \u003cstrong data-end=\"341\" data-start=\"322\"\u003elocal processor\u003c\/strong\u003e is powered from the 5V rail through a 3.3V LDO regulator and consumes \u003cstrong data-end=\"421\" data-start=\"412\"\u003e10 mA\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cp data-start=\"104\" data-end=\"124\"\u003e\u003cstrong\u003eERROR PROCESSING\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"126\" data-end=\"439\"\u003eOne pin on the spring-loaded terminal block of the Back Panel is reserved for signaling an error condition. The user can connect this pin to an external contact of their choice. When the error signal is activated, the \u003cstrong\u003e16 Analog 4–20 mA Outputs Card\u003c\/strong\u003e automatically resets all outputs to a predefined default state.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWATCHDOG:\u003c\/strong\u003e If the watchdog is enabled and the Raspberry Pi fails to access the 8-Channel 4–20 mA Output Card within the preset time, the card signals the Back Panel, which performs a hard reset of the Raspberry Pi by turning the power off for 10 seconds.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSTACK LEVEL: \u003c\/strong\u003eThe stack level is automatically determined by the slot into which the card is inserted on the Back Panel. It is shown on the OLED display after power up. Up to eight cards of the same type can be connected to a single Back Panel installation. Different cards can be mixed and matched up to eight types of each card.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eINTERRUPT:\u003c\/strong\u003e Any HOP card can be programmed to interrupt the Raspberry Pi. The interrupt handler running on Raspberry Pi needs to monitor pin 37 on the GPIO interface.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cstrong\u003eBACK PANEL TERMINAL BLOCK PINOUT\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003eEach slot on the Back Panel has alocated three 6-pin spring-loaded terminal blocks for IO wiring. The pinout is shown in the following picture:\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0534\/4392\/0067\/files\/TerminalBlock-IO.jpg?v=1759503531\" alt=\"Raspberry Pi Backpanel Terminal Block IO\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e16 Analog 4–20 mA Outputs\u003c\/strong\u003e: Odd-numbered inputs are routed to the high side, and even-numbered inputs to the low side.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eIO01-IO02: Output #1\u003c\/div\u003e\n\u003cdiv\u003eIO03-IO04: Output #2\u003c\/div\u003e\n\u003cdiv\u003eIO05-IO06: Output #3\u003c\/div\u003e\n\u003cdiv\u003eIO07-IO08: Output #4\u003c\/div\u003e\n\u003cdiv\u003eIO09-IO10: Output #5\u003c\/div\u003e\n\u003cdiv\u003eIO11-IO12: Output #6\u003c\/div\u003e\n\u003cdiv\u003eIO13-IO14: Output  #7\u003c\/div\u003e\n\u003cdiv\u003eIO15-IO16: Output #8\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003eIO17: ERROR\u003c\/div\u003e\n\u003cdiv\u003eIO18: PANIC\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003eIO17 is an open drain output triggered by a predefined error condition on an out of bounds input. It can be used to activate an external alarm, or can be routed back to IO18 to reset the outputs to a predefined state.\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003eIO18 is a dry contact to ground input and can be activated by an external contact wired to the Back Panel terminal block. When triggered, it resets all outputs to a predefined state. \u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eDOT MATRIX DISPLAY\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0534\/4392\/0067\/files\/16x4-20mA-OUT-OLED.jpg?v=1774720003\" alt=\"16x4-20mA outputs for Raspberry Pi Back Panel OLED display\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003eThe 16 Analog 4-20mA Analog Outputs card includes a 128 × 32 dot-matrix display driven by the on-board processor. It can show status information, self-test results, and error messages. At power up it displays the card name and the I2C address.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003c!--block--\u003e\u003cspan data-trix-serialize=\"false\" data-trix-cursor-target=\"true\"\u003e\u003c\/span\u003e\u003cspan data-trix-serialize=\"false\" data-trix-cursor-target=\"true\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e\n\u003c!--block--\u003eDOWNLOADS\u003c\/h3\u003e\n\u003cp\u003e3D STEP Model\u003c\/p\u003e\n\u003cp\u003e3D Printable Enclosure\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e\n\u003c!--block--\u003eSOFTWARE\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cp\u003eCommand Line Drivers\u003c\/p\u003e\n\u003cp\u003ePython Libraries\u003c\/p\u003e\n\u003cp\u003eCODESYS Driver\u003c\/p\u003e\n\u003cp\u003eOpenPLC Module\u003c\/p\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c!--block--\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c!--block--\u003e\u003c\/div\u003e\n\u003ch3\u003e\n\u003c!--block--\u003eQUICK START\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003c!--block--\u003ePlug the \u003cstrong\u003e16 Analog 4–20 mA Outputs Card\u003c\/strong\u003e on the Back Panel for Raspberry Pi and power up the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003c!--block--\u003eEnable I2C communication on Raspberry Pi using raspi-config.\u003c\/li\u003e\n\u003cli\u003e\n\u003c!--block--\u003eInstall the software from github.com:\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cul\u003e\n\u003cli\u003egit clone https:\/\/github.com\/SequentMicrosystems\/sequent-cli.git\u003c\/li\u003e\n\u003cli\u003ecd \/home\/pi\/sequent-cli\u003c\/li\u003e\n\u003cli\u003esudo make install\u003c\/li\u003e\n\u003cli\u003esequent-cli 4-20ma-out -h\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003c!--block--\u003eThe program will respond with a list of available commands.\u003c\/div\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/FAQPage\" itemscope=\"\"\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat Back Panel do I need to use this card?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eThis card is designed to plug directly into the Sequent Microsystems Raspberry Pi I\/O Back Panel, available in 4-slot and 8-slot versions. The Back Panel provides power, field wiring terminal blocks, CAN, RS485, and the 2×20 HOP connector that all cards in the family use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eCan I mix different HOP card types on the same Back Panel?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eYes. Any combination of HOP cards can be installed on the same Back Panel. You can mix analog output cards, analog input cards, digital I\/O cards, and any other cards in the HOP family in any slot order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eHow many Raspberry Pi units do I need?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eOnly one Raspberry Pi or Compute Module is needed for the entire system, regardless of how many Back Panels are chained together. The Raspberry Pi sits in the dedicated slot on one panel and communicates with all HOP cards across all linked panels via CAN and RS485.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat is the maximum number of HOP cards in a system?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eUp to 64 HOP I\/O cards can be installed in a single system. The 4-slot Back Panel supports up to 16 panels chained horizontally (16 × 4 = 64 cards). The 8-slot Back Panel supports up to 8 panels chained horizontally (8 × 8 = 64 cards).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eCan the cards operate without a Raspberry Pi?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eYes. Each HOP card has an onboard processor that implements the MODBUS RTU protocol over RS485. Any MODBUS master — PLC, SCADA system, or HMI — can read all inputs and control all outputs directly without a Raspberry Pi.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat software can I use to control the cards?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eHOP cards are supported by Command Line, Python, Node-RED, CODESYS, and OpenPLC. MODBUS RTU over RS485 and CANopen provide integration with third-party industrial software and controllers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat is the PANIC function?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eThe PANIC function is a safety feature available on all HOP output cards. It must first be enabled using a firmware command, and the user defines the default output levels to apply when PANIC is triggered. When the PANIC signal is received through the opto-isolated input on the Back Panel connector, the local processor immediately sets all outputs to those predefined levels — moving connected devices to a known safe state independently of the control software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat external power supply does this card require?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eThe 4–20mA outputs require an external 24VDC power supply. The supply connects to the Back Panel's power terminal block and is shared across all output channels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eWhat is load interruption detection?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eEach output continuously monitors the connected load. If the receiver is disconnected or fails, the card automatically detects the open circuit condition and flags it — allowing your software to respond to wiring faults or device failures in real time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eAre HOP cards compatible with all Raspberry Pi versions?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eYes. HOP cards are compatible with all Raspberry Pi versions from Zero to 5, as well as Compute Modules.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Question\" itemprop=\"mainEntity\" itemscope=\"\"\u003e\n\u003ch4 itemprop=\"name\"\u003eAre there any export restrictions on these cards?\u003c\/h4\u003e\n\u003cdiv itemtype=\"https:\/\/schema.org\/Answer\" itemprop=\"acceptedAnswer\" itemscope=\"\"\u003e\n\u003cp itemprop=\"text\"\u003eNo. All HOP cards are classified EAR99 under U.S. Export Administration Regulations and can be exported freely without a license to most destinations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sequent Microsystems","offers":[{"title":"Default Title","offer_id":47295418532092,"sku":"SM-P-140","price":95.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0534\/4392\/0067\/files\/16-analog-4-20-ma-blue-output-card-oled-display.jpg?v=1791991522","url":"https:\/\/sequentmicrosystems.com\/products\/16-analog-4-20-ma-outputs-raspberry-pi-back-panel","provider":"Sequent Microsystems","version":"1.0","type":"link"}