Host Protocol - Microscan MS-890 User Manual

Host Protocol

Usage:
In general, point-to-point protocols 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 scanner and the host, or in the case of
scanners and a concentrator.
Important: When using Polling Mode,
Postamble must be Disabled.
Serial Cmd: <K140,protocol,address>
Default:
Point-to-Point
Options:
0 = Point-to-Point
1 = Point-to-Point with RTS/CTS
2 = Point-to-Point with XON/XOFF
3 = Point-to-Point with RTS/CTS and XON/XOFF
4 = ACK/NAK
5 = Polling Mode
Point-to-Point (Standard)
Usage:
Used only with RS-232 or RS-422.
Definition:
Standard Point-to-Point requires no address and sends data to the host
whenever it is available, without any request or handshake from the host.
Serial Cmd: <K140,0>
Point-to-Point with RTS/CTS
Usage:
A scanner 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. CTS and RTS 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 handshaking protocol that allows a scanner to initiate data transfers
to the host.
Serial Cmd: <K140,1>
MS-890 Industrial Automation Scanner User Manual
Polling
LRC must be Enabled and Preamble/
Communications
Mode, between
3-5