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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: <K140,6RES,address,REQ,EOT,STX,ETX,ACK,NAK,from host>

Default: No address

Options: Any ASCII character except a NULL < , or >.

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Microscan Quadrus EZ Bedienungsanleitung Seite 33