Microscan MS-3 User Manual page 21

Point-to-Point with RTS/CTS
Usage: A reader initiates a data transfer with an RTS (request-to-send) transmis-
sion. The host, when ready, responds with a CTS (clear-to-send) and the
data is transmitted. CTS and RTS signals are transmitted over two dedi-
cated wires as defined in the RS-232 standard.
Used only with RS232.
Definition: Point-to-Point with RTS/CTS (request-to-send/clear-to-send) is a
simple hardware handshaking protocol that allows a reader to initiate
data transfers to the host.
Serial Cmd: <K140,1>
Note: When <K140,1> is sent, RTS/CTS takes effect without a save command.
Note: The host must allow every chance possible for the reader to output. If CTS is not
active for a long period of time, loss of data will occur.
Note: The reader cannot respond to multiple commands whenever CTS is inactive. Mul-
tiple commands will be buffered, but if a command generates a response to the host,
successive commands will not be processed until the response is output. This affects
both K commands and operational commands, including the reset commands <A>
<Z>, and <Zrd>.
Chapter 2 Communications
MS-3 CCD Reader User's Manual
2-5