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MS-2 CCD Reader User’s Manual 3-5

Communications

Host Port Protocol

Note: The preamble <K141> and postamble <K142> character strings can be used to

frame the decoded data in both protocol modes.

Point-to-Point (Standard)

Point-to-Point with RTS/CTS

Usage: In general, the point-to-point protocols will work well in most applications.

They require no address and must use RS-232 or RS-422 communications

standards.

Definition: Protocols define the sequence and format in which information is transferred

between the reader and the host.

Serial Cmd: <K140,protocol>

Default: Point-to-Point

Options: 0 = Point-to-Point

1 = Point-to-Point with RTS/CTS

Usage: Used only with RS-232 or RS-422.

Definition: Standard Point-to-Point requires no address and sends the data to the

host whenever it is available, without a request or handshake from the host.

Serial Cmd: <K140,0>

Usage: A reader initiates a data transfer with an RTS (request-to-send) transmission.

The host, when ready, responds with a CTS (clear-to-send) and the data is

transmitted. RTS and CTS signals are transmitted over two dedicated 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 handshake protocol that allows a reader to initiate data transfers

to the host.

Serial Cmd: <K140,1>

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Microscan MS-2 Manual de usuario Pagina 43