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Chapter 3 Protocol

MS-880 Industrial Long Range Scanner User’s Manual 3-5

3–Protocol

Point-to-Point with XON/XOFF (Transmitter On/Off)

Point-to-Point with RTS/CTS

Point-to-Point with RTS/CTS & XON/XOFF

Polling Mode D

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).

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.

Serial Cmd: <K140,1>

Definition: Point-to-Point with RTS/CTS (request-to-send/clear-to-send) is a

simple hardware handshaking protocol that allows a scanner to initiate

data transfers to the host.

Usage: A scanner initiates a data transfer with an RTS (request-to-send) trans-

mission. The host, when ready, responds with a CTS (clear-to-send)

and the data is transmitted. CTS and RTS signals are transmitted over

two dedicated wires as defined in the RS-232 standard.

Used only with RS-232.

Serial Cmd: <K140,2>

Definition: This option is a combination of Point-to-Point with RTS/CTS and

Point-to-Point with XON/XOFF.

Usage: Used only with RS-232.

Serial Cmd: <K140,3>

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.

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.

Serial Cmd: <K140,4>

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Microscan MS-4X Manual do Utilizador Página 55