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+--- Thread: Modbus CRC mistake (/showthread.php?tid=7370)
RE: Modbus CRC mistake - jltluc57 - 01-19-2025
Here,
RE: Modbus CRC mistake - admin - 01-19-2025
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
RE: Modbus CRC mistake - jltluc57 - 01-21-2025
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
RE: Modbus CRC mistake - admin - 01-21-2025
can you let your software output command remove "BYTE Count"? it MUST need included.
RE: Modbus CRC mistake - jltluc57 - 01-25-2025
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.
RE: Modbus CRC mistake - admin - 01-26-2025
If you make bulk purchases, you can design a new firmware about it based on KC868-A16v3 new PCB.
RE: Modbus CRC mistake - jltluc57 - 01-26-2025
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?
RE: Modbus CRC mistake - admin - 01-26-2025
my means, if you order new board at a large number in future, we can modify the firmware.
RE: Modbus CRC mistake - jltluc57 - 01-27-2025
Ok Thanks
RE: Modbus CRC mistake - jltluc57 - 02-01-2025
I have a problem with the CF15
Can you try to write 8 bits (output 0-7) when I do this, in fact it writes on outputs 8-15
Or you always have to work with 2 bytes so output 0-15