TE Technology TC-48-20 - Manual (Page 50)

50
0 30
0 30
0 30
0 30
Sum 121
16
The 8‐bit checksum is the 8 least significant binary bits of the sum, represented as 21 in
hexadecimal.
4. Combining the characters in one string we send: (stx)0100021(etx).
5. If the temperature controller receives the command and the checksum is correct, it will send
back: (stx)0019ca(ack). The “ca” at the end of the string is the checksum of “0019”. The
value 0019
16
converts to 25
10
. This number, when divided by 10, is 2.5‐‐the temperature in
°C. As in the other examples, if the controller did not calculate the correct checksum from
the query it would send back: (stx)XXXX60(ack).