Communications
MS-860 Industrial Raster Reader User’s Manual
6-5
Point-to-Point with RTS/CTS
Point-to-Point with XON/XOFF
Point-to-Point with RTS/CTS & XON/XOFF
Polling Mode D
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 RS-232.
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
>
Usage:
If an XOFF has been received from the host, data will not be sent to the
host until the host sends an XON. During the XOFF phase, the host is free
to carry on other chores and accept data from other devices.
Used only with RS-232.
Definition:
This option enables the host to send the XON and XOFF command as a
single byte transmission command of start (^Q) or stop (^S).
Serial Cmd:
<
K140,2
>
Usage:
Used only with RS-232.
Definition:
This option is a combination of
Point-to-Point with RTS/CTS and
Point-to-Point with XON/XOFF.
Serial Cmd:
<
K140,3
>
Usage:
When in
Polling Mode D, an address of 1 is automatically displayed on
the configuration screen. However, during transmission, a 1C hex poll
address (FS) and a 1D hex select address (GS) are substituted for the 1.
Definition:
Like
Point-to-Point, Polling Mode D requires a dedicated connection to
the host; but unlike
Point-to-Point, it requires an address and must
wait for a poll from the host before sending data.
Serial Cmd:
<
K140,4
>
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