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Advantech MIC-3921 Alarm Boards, Intelligent Monitoring and Alarm Module

Part Number



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Lead Time

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±3 °C

Baud Rate

1200, 2400, 4800, 9600, 19200 bps

Board ID

1 ~ 255 (0 for configuration only)

Humidity (Non-Operating)

- 5~95 % RH, non-condensing


RS-232/RS-485 (jumper selectable)


100,000 hours


5 minutes

Temperature (Operating )

0 ~ 50 °C (32 ~ 122 °F)

Temperature (Operating)

-20 ~ 70 °C (-4 ~ 158 °F)

Vibration (5-500 Hz)

1.0 Grms 2.0 G



pdf file


171 KiB

Extracted Text

MIC-3921 Intelligent Monitoring and Alarm Module Features § Monitoring: +3.3 VDC, +5 VDC, +12 VDC, -12 VDC system bus voltages § Four fan sensor inputs for fan speed monitoring § Three temperature sensor inputs § One "power good" signal input for power supply monitoring § Three channels of relay outputs for external alarm connection § One serial port can be set as RS-232 or RS-485 port, supporting modem output § Three configurable alarm levels: critical, major, minor § Audible alarm with three sound effects § On-board battery backup § Built-in watchdog timer for self-detection Introduction The MIC-3921 is an intelligent PC-system monitoring module. It can detect abnormal system conditions and generate alarm outputs, allowing users to take action before system failure. With the MIC-3921, the MIC-3031, MIC-3032, MIC-3033, and MIC-3081A systems are changed into intelligent, self-diagnostic systems, increasing the reliability of critical applications, such as in communications or computer telephony. The MIC-3921, equipped with a high-brightness vacuum fluorescent display and a control keypad, can be inserted into the MIC-3031, 3032, and 3081A. Powerful Functions The MIC-3921 can detect a wide variety of internal system conditions including temperatures, voltages, fan operation and power supply status. It can generate several different alarm outputs including acoustic signals and relay outputs to notify nearby users. It can also send messages through the serial port for remote notification. The on-board CPU allows users to set the alarm criteria for each input sensor independently and to program different alarm outputs. High Reliability To ensure operational reliability, the MIC-3921 features a built-in watchdog timer for self-testing. The on-board backup battery enables non-stop operation even in the event of total system power failure. Remote Monitoring The MIC-3921 serial port can be configured either as RS-485 to communicate over distances up to 4000 feet, or as RS-232 to connect to other devices such as a modem. Users can remotely monitor a number of computers through a host computer's serial port. Software Support The MIC-3921 is shipped with a powerful and easy-to-use software utility to minimize the time for system integration. "PC Sentry" can run under Windows 95/98/NT. This allows the system host to communicate with one or more alarm modules via the serial port, for configuration, alarm level setting, real-time status display, alarm event logging and so on. Online Download www.advantech.com/products Advantech may make changes to specifications and product descriptions at any time, without notice. Last Updated: March-03-04 MIC-3921 Specifications Features SystemVoltage +3.3V +5V +12V -12V Voltage 0~+4.8V 0~+6.8V 0~+16.32V 0~-16.32V VoltageAccuracy 0.5%ofFSR Sensor1(OnBoard) 0~60°C(32~140°F) Temperature Sensor2and3 30~125°C(86~257°F) Accuracy ±3°C Sensor1,2,and4 700~10000rpm Fan Sensor3 2800~40000rpm Hi >2.4V PowerGoodInput Lo <0.8V Output NC(normallyclosed)andNO(normallyopen) Relay PowerRating AC125V@0.3A,DC100V@0.3A,DC30V@1A Interface RS-232/RS-485(jumperselectable) SerialPort BaudRate 1200,2400,4800,9600,19200bps BoardID 1~255(0forconfigurationonly) ChargeTime 24hours Battery Capacity 1200mA-H(fullcharged,for0.5~1hroperation) Operating Non-Operating Temperature 0~50°C(32~122°F) -20~70°C(-4~158°F) Environment Humidity -- 5~95%RH,non-condensing Vibration(5-500Hz) 1.0Grms 2.0G Reliability MTBF 100,000hours Serviceability MTTR 5minutes Ordering Information Dimension Diagram PartNumber Descriptions Intelligentsystemmonitoringandalarmmodulewith MIC-3921 MIC-3921-A vacuumfluorescentdisplay,keypadandutilityCD (16.73") (8.07") (89.37") (27.56") (12.99") (0.98") (9.06") (18.50") (12.60") Unit: mm (inch) Online Download www.advantech.com/products Advantech may make changes to specifications and product descriptions at any time, without notice. Last Updated: March-03-04 (57.48") (19.14") (16.82") (25.20") (4.33") (66.93")

Frequently asked questions

What makes Elite.Parts unique?

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At GID Industrial (Elite.Parts' parent company), we specialize in procuring industrial parts. We know where to find the rare and obsolete equipment that our customers need in order to get back to business. There are other companies who claim to do what we do, but we're confident that our commitment to quality and value is unparalleled in our field.

What kind of warranty will the MIC-3921 have?

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Warranties differ by part and by which suppliers we use to procure it for you. Sometimes, a part will be sold as-is and without a warranty. Our specialty, single board computers, tend to receive a one-year warranty.

Which carriers does Elite.Parts work with?

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Elite.Parts can ship via FedEx, UPS, DHL, and USPS. We have accounts with each of them and generally ship using one of those, but we can also ship using your account if you would prefer. However, we can use other carriers if it will be more convenient for you.

Will Elite.Parts sell to me even though I live outside the USA?

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Absolutely! We are happy to serve customers regardless of location. We work with international clients all the time, and we are familiar with shipping to destinations all across the globe.

I have a preferred payment method. Will Elite.Parts accept it?

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All major credit cards are accepted: Visa, MasterCard, Discover, and American Express. We will also accept payment made with wire transfer or PayPal. Checks will only be accepted from customers in the USA. Terms may available for larger orders, upon approval.

Why buy from GID?



We are industry veterans who take pride in our work



Avoid the dangers of risky trading in the gray market



Our network of suppliers is ready and at your disposal



Maintain legacy systems to prevent costly downtime



Time is of the essence, and we are respectful of yours

What they say about us


star star star star star

One of our top priorities is maintaining our business with precision, and we are constantly looking for affiliates that can help us achieve our goal. With the aid of GID Industrial, our obsolete product management has never been more efficient. They have been a great resource to our company, and have quickly become a go-to supplier on our list!

Bucher Emhart Glass


star star star star star

With our strict fundamentals and high expectations, we were surprised when we came across GID Industrial and their competitive pricing. When we approached them with our issue, they were incredibly confident in being able to provide us with a seamless solution at the best price for us. GID Industrial quickly understood our needs and provided us with excellent service, as well as fully tested product to ensure what we received would be the right fit for our company.



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Our company provides services to aid in the manufacture of technological products, such as semiconductors and flat panel displays, and often searching for distributors of obsolete product we require can waste time and money. Finding GID Industrial proved to be a great asset to our company, with cost effective solutions and superior knowledge on all of their materials, it’d be hard to find a better provider of obsolete or hard to find products.

Applied Materials


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Over the years, the equipment used in our company becomes discontinued, but they’re still of great use to us and our customers. Once these products are no longer available through the manufacturer, finding a reliable, quick supplier is a necessity, and luckily for us, GID Industrial has provided the most trustworthy, quality solutions to our obsolete component needs.

Nidec Vamco


star star star star star

This company has been a terrific help to us (I work for Trican Well Service) in sourcing the Micron Ram Memory we needed for our Siemens computers. Great service! And great pricing! I know when the product is shipping and when it will arrive, all the way through the ordering process.

Trican Well Service


star star star star star

When I can't find an obsolete part, I first call GID and they'll come up with my parts every time. Great customer service and follow up as well. Scott emails me from time to time to touch base and see if we're having trouble finding something.....which is often with our 25 yr old equipment.

ConAgra Foods

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