Dear KinCony Team,

I am currently designing a DIY smart home system for my new residence and am exploring reliable and industrial-grade relay modules for automation tasks. I came across your KC868 series, and I am particularly interested in relay boards that support 24 V digital inputs and outputs.

As part of this setup, I plan to integrate lighting, gate control, heating valves, and sensor monitoring—where 24 V contact inputs are crucial. If your solution proves stable and reliable in my initial tests, I am planning to purchase a larger board (such as the KC868-A32 or KC868-E16T) for full deployment across multiple zones in my home.

I would like to kindly request a sample relay board with 24 V input compatibility for evaluation. If possible, a model with at least 4–8 relay outputs and 4–8 digital inputs would be ideal for my testing phase.

Please let me know if you need any further details about my project. I’d be happy to share progress, feedback, and documentation on how your product performs in a DIY smart home setting.

Thank you for your consideration.

Hi,

I have a KC868-A16S V1.1.
I have a problem with sms, I can do a phone test to my mobile phone and I receive the KC868 sms, it's ok.
With a digital input I can do a "Relay on" and it send me a sms notify message, ok.

The issue is when I want to send with my phone, a sms control to change a relay state, in this case, the KC868 doesn't do anything with IFTT.
It's like the KC868 doesn't receive the sms command.

How to find the issue ?

Thanks

I have tried to configure KS868-HA-V21 module with KC868-A6 using EspHome. Connection between A6 and KS686-HA works good, at least I can see debug logs, when attach K1 (or any other K pin) to GND:

Fingerprint sensor R503 do not scan finger. I use KC868-A16 with ESPHome.
Sensor is connected to HT1/2 port as Uart. I can control aura led but I get only "No touch sensing" message.
"Wakeup" signal connected to HT3 all time is OFF. When I send command to enroll "Wakeup" goes to ON but sensor dont scan any finger.
Can anyone help?
   

Hi KinCony team,
Hardware
• KC868-A16 (ESP32, ESPHome 2025.2.2, UART TX GPIO13 / RX GPIO16, 9600 baud, 8-N-1)
• Two R4DCB08 temperature-collector boards, each with 4-8 × DS18B20 probes
• 24 V DC power supply feeding both collectors
• RS-485 cabling: shielded twisted pair
Address & jumpers
• Board 1 → Modbus ID 0x01, TERM OFF, BIAS OFF
• Board 2 → Modbus ID 0x02, TERM ON (far end), BIAS OFF
• KC868 terminator jumper → ON when only board #1 is present, OFF when both boards are in the chain
Wiring topology
KC868 A/B/GND → short stub to board #1 → 3 m cable → board #2 (terminator)
(I originally had both collectors fanned out from a terminal block; I have now rewired them in strict daisy-chain as shown in the attachment.)
Symptoms
• With only board #1 on the line everything is stable – ESPHome reads register 0x0000 and publishes 23.8 °C.
• As soon as I plug in board #2 I get continuous
csharp
CopyEdit

1. Checked DIP addresses (01 / 02) – OK
   
2. Verified 5 V on both collectors while polling – 5.05 V
   
3. Tried baud 2400 on both sides – still CRC errors
   
4. Tested with just 30 cm jumpers between boards – same result
   

I work at Sideout projects and we are automating a machine and I have verified that your product may be compatible with it, and we would like to use it for testing. We would like to verify the quality of the product and in the future use the KC868-A16.

Hi,
I recently purchased a second KC868-A16 , the first one installed ~4 months ago works fine
But the new one can't download firmware  using flash download tool  (see attached file)
I tried the followinf steps:
 1) use the original Usb c cable , and try another one  (no usb hub)  same  from anotehr PC  -> NOK
 2) using flash downlod tool with different rate ->  (see attached download tool log) => NOK
 3) Trying upload using esphome  -> NOK  (see attached error log)
 4) Even connected to Lan netowrk   the scan tool can't detect it

NB : 

The usb device is connected when plugged but there is communication issue or flash issue.

Thank you for your support. 

Regards.

Attached Files

Thumbnail(s)
   

  ECE334680F4C.txt (Size: 2.97 KB / Downloads: 226)
  esphome_errors.txt (Size: 1.46 KB / Downloads: 247)

Hello KinCony Admin
I want to send activation commands from 1 KC868-A to 2 different H32B PRO controllers.
I'm integrating a KC868-AK ESP32 board (as an input controller) with other KinCony relay boards (as slaves) using RS485 and your String Protocol. I've seen the KC868-A-series-protocol-String_firmware_V2-2.pdf document and understand that the String Protocol is supported over RS485.

1. String Protocol DEV_ID: How is the DEV_ID (e.g., "255" in RELAY-KEY-255,id,1) set/configured on KinCony relay boards for RS485 String Protocol? Is there a default, and can it be changed?
   
2. RS485 Settings: What are the exact default/recommended RS485 settings (Baud Rate, Stop Bits, Parity) for KinCony boards using the String Protocol?
   
3. RTS Pin for KC868-AK RS485: Is an RTS pin required for RS485 communicationon the KC868-AK ESP32 with the String Protocol? If so, which GPIO pin and is it active HIGH/LOW?
   
4. Relay ID Mapping:  Does the id in RELAY-KEY-DEV_ID,id,1 directly correspond to the physical relay number (e.g., id=1 for Relay 1, id=16 for Relay 16)?
   

I have two A32 Pro controllers—one installed on each floor. I would like to achieve the following functionality: when input 25 on controller 1 is activated, the output on controller 2 should toggle accordingly.
Is it possible to implement this directly using the controllers' software, or would I need to use an intermediate server or external device to achieve this?

Thanks in advance.