method for string send/get via modbus

terefere

Any idea?. Im not happy from actual solution- I smash word to letter and made many steps to get result ;/

If后要接end

Maybe you can convert the string to hexadecimal data and send it

terefere

I can, but how?

        MD_BUF[0] = 65
        MD_BUF[1] = 66
        MD_BUF[2] = 67
        MD_BUF[3] = 68
        MD_BUF[4] = 69
        MD_BUF[5] = 70
        MD_BUF[6] = 71
        MD_BUF[7] = 72
        MD_BUF[8] = 73
        MD_BUF[9] = 74

if I write

1. MD_BUF[2] = string.char(MD_BUF[2])

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Then is fine- 67 ich change to C. But if I place it to loop

1.         for i=1, 10, 1 do
   
2.                 MD_BUF[i] = string.char(MD_BUF[i])
   
3. 
   
4.         end

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, then I get error "bad argument #1, number expect, got string". Next I think to use .concat to get one string, but here I also have small problem, because modbus table start from 0 but string and operation in contact starts from 1.

BTW, from ASCI to hext I made this, and look's like work

1.         for i=1, 10, 1 do
   
2.                 a =  NAME_BUF:byte(i)
   
3.                 b = i
   
4.                 print(a)
   
5.                 if (a == nil) then break end
   
6.                 MD_BUF[i-1] = a
   
7.         end
   
8.         MD_BUF[b] = 0
   
9.         MD_BUF[b+1] = nil
   
10.         mb_write_reg_16 (_MB_ADR,170,MD_BUF)

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