Smart Home Automation Forum

KC868-COLB support use by MQTT or TCP Server or TCP Client work mode. When using MQTT, use Json format send command. When using TCP by HEX format command. KC868-COLB's PC software support "DEBUG" mode for programmer developing.
[attachment=708]
open your KC868-COLB PC software, use mouse left button quick click > 5 times will enable "DEBUG" mode.


[attachment=709]
this page for debug relay


[attachment=710]
this page for read digital input, analog input and DS18B20 temperature sensor data.

[attachment=711]
this page for debug set temperature and analog input threshold and RTC clock

[attachment=712]
This is write RTC clock example.

for example, set RTC clock:
we set 2022-03-08  21:38:00 to KC868-COLB

send command is:
5E 01 32 C0 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 16 03 08 15 26 00

0x5E 01 : begin byte, never change it.
0x32 C0: command type
0x06 00: message length  now the message is "16 03 08 15 26 00"  total 6 bytes
0x00 ... ... 00  38 of 0x00 retain bytes, not chang it.
0x16 03 08 15 26 00 is year,month,date, hour,minute,second
0x16=22 use two last number of year, default begin with20 so year=2022
0x03=03
0x08=08
0x15=21
0x26=38
0x00=00

how to send RS485 command to KC868-COLB. 
Let's see an example: How to read data of electric energy meter by KC868-COLB via RS485 ModBus


1. Read power consumption:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 00 00 02 CE 40

5E 01 03 C0 is fixed, never change. 5E 01 is begin byte, 03 C0 is command for RS485.
08 00 is message command length, now it's 8 bytes.
38pcs of "00" is reserved area for furture.
7A 03 00 00 00 02 CE 40  is send for power meter, this is ModBus protocol
7A hex->dec is 122.  122 is power meter address ID.

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 42 53 33 33 81 B8

7A 03 04 42 53 33 33 81 B8

7A hex->dec is 122.  122 is power meter address ID.
03 is Modbus function: read    04 is length of data      81 B8 is CRC code
42 53 33 33 is float , need convert to dec, 0x42533333 is 52.8 Kwh

[attachment=736]  [attachment=737]

2. Read power voltage:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 64 00 02 8F 9F

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 43 5C 00 00 E4 A2


7A 03 04 43 5C 00 00 E4 A2
43 5C 00 00 is float , need convert to dec, 0x435C0000 is 220V

3. Read power current:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 6A 00 02 EE 5C

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 3F 99 99 9A 07 34


7A 03 04 3F 99 99 9A 07 34
3F 99 99 9A is float , need convert to dec, is 1.2A

4. Read power:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 76 00 02 2F 9A

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 3F 5C 28 F6 63 74

7A 03 04 3F 5C 28 F6 63 74
3F 5C 28 F6 is float , need convert to dec, is 0.86kw

5. Read power factor:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 8E 00 02 AE 6B

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 3F 73 33 33 98 1E


7A 03 04 3F 73 33 33 98 1E
3F 73 33 33 is float , need convert to dec, is 0.95Q

6. Read power frequency:
Example:
Send:
5E 01 03 C0 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 00 90 00 02 CE 6D

Feedback:
5E 01 03 C0 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7A 03 04 42 48 0A 3D 62 2B


7A 03 04 42 48 0A 3D 62 2B
42 48 0A 3D is float , need convert to dec, is 50.01Hz