Does serial interface control work? a message "fail" is received as response to any symbol sent to the controller.

I have not tried this. I don't know the protocol, there are several that could be used.

Is the micro USB port for power only?

You can also use it to send commands to the unit and read values.

How to enable the emergency stop function in cooling mode? if i enable ala setting, the board alerts as expected but the relay stays open.

You need a clip on aqua stat the opens below 40° f and connect it in series with the yellow wire on the air handler. The freeze protection terminal are to protect hydronic heating coils.

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DROK Electronic Thermostat Controller, DC 6-30V 24V Digital Temperature Control Board -50 to +110 Degree Celsius High Accuracy LCD Digital Micro Temp Control Switch Module with Waterproof Sensor Probe

Product ID: 87089335

⚡10A high current relay output

📟Bright LCD for clear real-time temp

🌡️-50°C to 110°C precision range

₹ 2493

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Description

🌡️ Master your environment with precision and power — don’t let your setup fall behind!

ROBUST 10 A RELAY OUTPUT - Handle high current loads effortlessly, perfect for demanding industrial or home automation setups.
CRYSTAL CLEAR LCD DISPLAY - Stay informed at a glance with a bright, wide-angle LCD that keeps your temperature data front and center.
POWERHOUSE PRECISION CONTROL - Experience ultra-accurate temperature regulation from -50°C to 110°C with 0.1°C precision—never miss a beat in your environment.
SMART USER FRIENDLY INTERFACE - Quickly customize settings with intuitive buttons and save parameters automatically—control made effortless.
WATERPROOF SENSOR FOR VERSATILE USE - Deploy confidently in any setting, from aquariums to automotive systems, thanks to a durable 0.5m waterproof probe.

The DROK Electronic Thermostat Controller is a compact, high-accuracy digital temperature control board operating on DC 6-30V or 5V USB power. It features a robust 10A relay output, a wide temperature range from -50°C to 110°C with 0.1°C precision, and a bright LCD display for real-time monitoring. Equipped with a 0.5m waterproof sensor probe and user-friendly interface, it supports advanced functions like temperature correction, alarms, and emergency stop, making it ideal for industrial, automotive, and home automation applications.

Specifications

ASIN	B07GQPT9VG
Best Sellers Rank	#48,840 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #50 in Temperature Controllers
Date First Available	August 22, 2018
Item Weight	1.58 ounces
Item model number	200368
Manufacturer	DROK
Package Dimensions	4.2 x 2.2 x 1.6 inches

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₹ 2493

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to India.

Secure transaction

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Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

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