MS-1 Scan Engine
User Manual
5-5
Communications
Host Port Protocol
Note:
The preamble
<K141>
and postamble
<K142>
character strings can be used to
frame the decoded data in both protocol modes.
Point-to-Point (Standard)
Point-to-Point with RTS/CTS
Usage:
In general, the point-to-point protocols will 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 MS-1 and the host.
Serial Cmd:
<
K140,
protocol
>
Default:
Point-to-Point
Options:
0 = Point-to-Point
1 = Point-to-Point with RTS/CTS
Usage:
Used only with RS-232 or RS-422.
Definition:
Standard
Point-to-Point
requires no address and sends the data to the
host whenever it is available, without a request or handshake from the host.
Serial Cmd:
<
K140,
0
>
Usage:
An MS-1 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. RTS and CTS 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 handshake protocol that allows an MS-1 to initiate data transfers
to the host.
Serial Cmd:
<
K140,
1
>
