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Host Port Protocol
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 reader and the host.
Serial Cmd:
<K140,protocol>
Default:
Point-to-Point
Options:
0 = Point-to-Point
1 = Point-to-Point with RTS/CTS
Note: The preamble
frame the decoded data in both protocol modes.
Point-to-Point (Standard)
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>
Point-to-Point with RTS/CTS
Usage:
A reader 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 a reader to initiate data transfers
to the host.
Serial Cmd:
<K140,1>
MS-2 CCD Reader User's Manual
<K141>
and postamble
<K142>
character strings can be used to
Communications
3-5
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