Microscan MS-615 User Manual page 30

Chapter 2 Menu Configuration
Host Protocol
Protocol
Default: Point-to-Point
Options: Point-to-Point, Point-to-Point with RTS/CTS, Point-to-Point with
XON/XOFF, Point-to-Point with RTS/CTS & XON/XOFF, Polling
Mode D, User Defined, User Defined Multidrop
Protocols define the sequence and format in which information is trans-
ferred between devices.
Selecting:
Point-to-Point
Point-to-Point with
RTS/CTS (Request-
to-Send/Clear-to-
Send)
Point-to-Point with
XON/XOFF
(Transmitter On/Off)
Point-to-Point with
RTS/CTS & XON/
XOFF
Polling Mode D
2-6
MS-610 Scanner User's Manual
Has this effect:
Has no address and sends data to the host (RS-232)
whenever it is available and without any request or
handshake from the host.
Used only with RS-232. This is a simple handshaking
protocol that allows a device to initiate data transfers to
the host with an RTS (request-to-send) transmission.
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 (pins
6 and 10) as defined in the RS-232 standard.
Used only with RS-232. This selection enables the host
to send a single byte transmission command of start
(XON) or stop (XOFF). 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. It is a combination of Point-to-
Point with RTS/CTS and Point-to-Point with XON/
XOFF.
Like Point-to-Point, Polling Mode D requires a separate
channel to the host but unlike Point-to-Point, it requires
a device to have an address and to wait for a poll from
the host before sending data.
When in Polling Mode D, an address 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.