GTCO Surface-Lit AccuTab - Users Guide - Manual (Page 12)

Surface-Lit AccuTab 12
3. On the AccuSet Menu, select the two digits of the AccuSet Code for your application
program. You will hear one short beep after the first digit. Then, following the
second digit, you will hear the four short “Success!” tones informing you that the
AccuTab has reset itself to the new configuration. The proximity light on the
transducer will also flash four times.
To cancel a menu selection before it is complete, digitize a point in the tablet’s main
active area. Three long beeps will indicate that the AccuSet selection process has
been aborted. The proximity light on the transducer will also flash three times.
4. Run the corresponding application program on your computer.
NOTE: Hardware flow control is not supported by the AccuTab Controller. If you
have an application that requires this option, contact GTCO CalComp by Turning
Technologies for alternatives.
Flow Control
Flow control is the process of regulating the traffic or flow of data between two RS-232C
devices. Flow control prevents the transmission and subsequent loss of data if the receiver
is not ready to accept it. Examples of devices that use flow control are: a printer to signal
buffer full; a modem to indicate carrier detect; and a time-shared computer that services
multiple users on a time-available basis.
There are two kinds of flow control:
 Software flow control is often implemented over communication links where only a
3-wire cable is used (Transmit Data, Receive Data, Ground) or over telephone lines.
The sending device (such as the AccuTab) will immediately stop sending data when
it receives an ASCII XOFF character (CTRL-S, hex 13). Transmission will resume when
it receives an ASCII XON character (CTRL-Q, hex 11). Character flow control will work
with the straight through cable and the null modem cable.
 Hardware flow control is not commonly used with digitizers and is therefore not
supported by the AccuTab Controller.
Flow control may not be needed when a terminal or digitizer is directly connected to a
single-user computer. Most digitizing application software does not use flow control of
either kind.