What is this ? and where are the checksums Newby in all this so forgive me

 

hi Z,
Where is the serial data coming from, what equipment.?
E

 

hi Z,
Where is the serial data coming from, what equipment.?
E

hello it comes from microcontroller it sends message id slave AD reply DC1 followed by checksum so there
is an error checking i assume the checksum regards paul

 

Try to capture/display the data in HEX or some other binary format, not in ASCII. It could be that the data is being sent in binary format.

 

What is this ? and where are the checksums Newby in all this so forgive me

Understand that the characters you're seeing are only representations of the binary data actually being received. If your baud rate is correct. If your baudrate is wrong however, you're just getting representations of junk bits.

 

It looks like binary to me, too. Note the character representations of some of the control characters. On the bottom line is NUL NUL NUL just before the ASCII 'F'. That is binary data 00h 00h 00h 46h displayed as ASCII characters. The good news is that RealTerm appears to be able to display hex, binary etc so search around for that in the terminal menus.
From the RealTerm description:

Binary display modes -Hex,Int,Float,Signed/Unsigned,

https://sourceforge.net/projects/realterm/

There's likely more than that going on but starting with a hex output would be good.
Good luck and welcome to AAC!

 

O2 - 0F SLAVE ADDRESS I’d 2-15 on bus
Example string 02 01 AD reply 11 FD 00 FF B9 next 03 01 AE reply 11 FD 00 FF B9
11 FE BA Checksum I think cheers for help

 

It looks like binary to me, too. Note the character representations of some of the control characters. On the bottom line is NUL NUL NUL just before the ASCII 'F'. That is binary data 00h 00h 00h 46h displayed as ASCII characters. The good news is that RealTerm appears to be able to display hex, binary etc so search around for that in the terminal menus.
From the RealTerm description:

https://sourceforge.net/projects/realterm/

There's likely more than that going on but starting with a hex output would be good.
Good luck and welcome to AAC!

 

11 seems to be master 0E in hex as on screen is address E on the bus 01 is the number of line the devices are connected as there is 3 independent bus lines the hex code is on the screen thanks again