Microscan MS-810, User Manual

Page: 35 / 144

Protocol Menu
MS-810 Industrial Scanner User’s Manual
2-13
2–Menu C
o
n
fig
.
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.
Point-to-Point with XON/XOFF (Transmitter On/Off)
Used only with RS-232. This selection enables the host to send a single byte transmis-
sion 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.
Point-to-Point with RTS/CTS & XON/XOFF
Used only with RS-232. It is a combination of Point-to-Point with RTS/CTS and Point-
to-Point with XON/XOFF.
Polling Mode D
Like Point-to-Point, Polling Mode D requires a separate 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. When in Polling Mode D, an address of 1 is automatically dis-
played 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.
Multidrop
Note: Scanners intended to link up to a Microscan MS-5000 multidrop concentrator
must be configured in standard Multidrop protocol.
Similar to Polling Mode D except that a unique poll address and select address are
required for each multidrop device, and only one host port connection is needed for up to
50 devices. (For Multidrop poll and select characters, see
Table A-12, “Multidrop
Address Characters,” on page A-35 .)
Requires a concentrator or controller using RS-485 communications. When Multidrop
is selected, the protocol characters for RES, REQ, etc. are assigned automatically.
(See
“Appendix M — Multidrop Communications” on page A-33 for poll and
select sequences.)
User Defined Point-to-Point
Note: A specific ASCII character must not be assigned more than once.
Used only with RS-232. User Defined is necessary when a new protocol must be
defined to match a specific host protocol. ASCII characters can be assigned as an
address and as protocol commands (RES, REQ, EOT, STX, ETX, ACK, NAK, From Host).
In order to enable a handshaking protocol, you must manually assign values where
necessary. When User Defined is selected, the displayed protocol commands match
those of the previously selected protocol. User Defined is considered to be in a polled
mode only if an address has been assigned. The address can be any ASCII character
from the ASCII table in Appendix D . If null is selected as the address, the scanner
will not function in a polling sequence. From Host, if enabled, allows the handshaking
protocol to be initiated from the host, if unpolled.