5.6Check Sum
The check sum is obtained by converting the transmitted DTMF tone string (Account No. + Control data field) values to character string according to ASCII code table 1 and adding them.
In this case, the asterisk "*" between the account number and control data field is excluded.
Example:
“12345” + ‘*’ + “#8912” + “C236789” + ‘*’ + Check sum + ‘*’
Check sum calculation is as follows:
49 (for 1) + 50 (for 2) + 51 (for 3) + 52 (for 4) + 53 (for 5) + 35 (for #) + 56 (for 8) + 57 (for 9) + 49 (for 1) + 50 (for 2) +
67 (for C) + 50 (for 2) + 51 (for 3) + 54 (for 6) + 55 (for 7) + 56 (for 8) + 57 (for 9) = 943
“0943” is transmitted as the check sum.
40672201TX Rev.4 |