Unitech Hand Held Scanner - Manual (Page 11)

Page 10
BCC Character:
BCC check character is calculated for entire data stream by using
“Exclusive OR ” method. It is sent after data stream for data
verification.
Time Out:
You can adjust the Time Out duration for handshaking and ACK/NAK
protocol to fit applications.
3.3 Serial TTL
This scanner supports serial TTL interface which follows the RS232
communication data format but with TTL voltage output ranged from
0V to 5V.