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Quadrus EZ Reader User’s Manual
2-7
Communications
Point-to-Point with RTS/CTS
Point-to-Point with RTS/CTS & XON/XOFF
Polling Mode D
User Defined Point-to-Point
User Defined Address
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 trans-
fers to the host.
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 menu. 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 >
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>
Definition:
User Defined is considered to be in a polled mode only if an address has
been assigned.
Serial Cmd: < K140,6 RES, address ,REQ,EOT,STX,ETX,ACK,NAK,from host>
Default: No address
Options: Any ASCII character except a NULL < , or > .