Microscan MS-3000 User Manual page 32

Chapter 2 Menu Configuration
There are three subtopics in this menu: Host Protocol, Host Port, and Aux Port.
To help visualize the menu's organization and to locate the page number
where each topic is described, see
Structure," on page
Note: Changes in Communications parameters or assigning an address to the
decoder can cause loss of communications with the configuration terminal when
you exit the menu program (whether or not changes are saved for power-on).
Host Protocol Parameters
Protocol
Default: Point-to-Point
Options: Point-to-Point, Point-to-Point with RTS and CTS, Point-to-Point
with XON/XOFF, Point-to-Point with RTS/CTS and XON/XOFF,
Polling Mode D, Multidrop, User Defined, User Defined Multidrop
Protocols define the sequence and format in which information is transferred
between devices. Generally there are two basic protocol modes: unpolled
and polled. In unpolled mode (all of the Point-to-Point protocols), a device
sends information without being asked for by the host. In polled mode (Multi-
drop, Polling Mode D, and User Defined Multidrop), a device has an address
and waits for a request from the host before sending data.
Note: User Defined and User Defined Multidrop have more options available to
them. Selection instructions for these protocols are provided under each topic.
Selecting:
Point-to-Point
Point-to-Point with
RTS/CTS (Request-to-
Send/Clear-to-Send)
2-6
MS-3000 Single Head Decoder User's Manual
figure 2-2, "Communications Menu
2-5.
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. RTS
and CTS signals are transmitted over two dedicated
wires (pins 4 and 5) as defined in the RS-232
standard.