Modbus CRC mistake

[jltluc57]

Here,

[admin]

for example, if you want turn ON output1,output3, others all off
send:01 0F 00 00 00 10 00 05 BF 01
receive:01 0F 02 00 00 BB 14
   
note about the "send" command: 
01: address
0F: functon code
00 00: address 00 fixed
00 10: because KC868-A16 have 16 channel output, so it's 0x10
00 05: means OUTPUT1, OUTPUT3: ON, others: OFF
BF 01: CRC
   

[jltluc57]

Ok, it works for you.
but for me it is not the modbus standard, the "ByCout" byte is missing

I have been using my software for over 20 years and it works with all PLCs.
Here is an example with a Twido PLC


SLave :1 
Cf : F
Adress : 0 0 
Nb : 8
BYTE Count : 1
CRC : BE D5

[admin]

can you let your software output command remove "BYTE Count"? it MUST need included.

[jltluc57]

Hello

By going outside the Modbus standard, without the Bycout, it works.

So I can't use this product with (CF15) on products that respect the standard like Schneider PLCs.

[admin]

If you make bulk purchases, you can design a new firmware about it based on KC868-A16v3 new PCB.
   

[jltluc57]

I don't understand well. With the new card I can modify the firmware of the card (your firmware) to adapt the protocol?

Or you can modify it for me?

[admin]

my means, if you order new board at a large number in future, we can modify the firmware.

[jltluc57]

Ok Thanks