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Point-to-Point with RTS/CTS
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-
Usage:
cated wires as defined in the RS-232 standard.
Used only with RS-232.
Point-to-Point with RTS/CTS (request-to-send/clear-to-send) is a simple
Definition:
hardware handshaking protocol that allows a reader to initiate data trans-
fers to the host.
Serial Cmd:
<K140,2>
Point-to-Point with RTS/CTS & XON/XOFF
Usage:
Used only with RS-232.
This option is a combination of Point-to-Point with RTS/CTS and Point-
Definition:
to-Point with XON/XOFF.
Serial Cmd:
<K140,3>
Polling Mode D
When in Polling Mode D, an address of 1 is automatically displayed on the
Usage:
configuration menu. However, during transmission, a 1C hex poll address
(FS) and a 1D hex select address (GS) are substituted for the 1.
Like Point-to-Point, Polling Mode D requires a dedicated connection to
Definition:
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>
User Defined Point-to-Point
Usage:
Useful for developing custom protocols in polled or unpolled mode.
Definition:
Allows the user to customize the point-to-point protocol.
Serial Cmd:
<K140,6,RES,address,REQ,EOT,STX,ETX,ACK,NAK,from host>
User Defined Address
User Defined is considered to be in a polled mode only if an address has
Definition:
been assigned.
Serial Cmd:
<K140,6RES,address,REQ,EOT,STX,ETX,ACK,NAK,from host>
Default:
No address
Options:
Any ASCII character except a
Quadrus EZ Reader User's Manual
NULL < ,
or >.
Communications
2-7
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