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

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 max relay output

💧Waterproof 0.5m sensor probe

🌡️-50 to 110°C precision range

Rp539452

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Description

🌡️ Stay cool, stay precise — control your climate like a pro!

CLEAR LCD DISPLAY - Bright, easy-to-read screen ensures you’re always in control at a glance.
SMART USER INTERFACE - Quick settings, real-time reporting, and temperature correction make setup effortless.
ROBUST HIGH CURRENT RELAY - Handles up to 10A load, perfect for demanding appliances and equipment.
VERSATILE WATERPROOF SENSOR - Reliable 0.5m probe works seamlessly in wet or dry conditions across multiple applications.
PRECISION TEMPERATURE CONTROL - Maintain exact temps with 0.1°C accuracy for flawless environment management.

The DROK Electronic Thermostat Controller is a compact, high-accuracy digital temperature control module operating from DC 6-30V or 5V USB power. Featuring a 10A relay output, it supports a wide temperature range from -50°C to 110°C with 0.1°C precision. Its bright LCD display and waterproof 0.5m sensor probe enable versatile use in appliances, automotive, and electronics, while user-friendly functions like real-time temperature reporting, alarms, and easy parameter setting ensure reliable, professional-grade climate control.

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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