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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 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, or in the case of Multidrop, between the
readers and a concentrator.
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
Note: In all protocol modes, the preamble
strings can be used to frame the decode data, and both are included in calculating the
LRC Status
(Longitudinal Redundancy Check).
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>
Point-to-Point with XON/XOFF
Usage:
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.Used only with RS-232.
Definition:
This option enables the host to send the XON and XOFF command as a
single byte transmission command of start (^Q) or stop (^S).
Serial Cmd:
<K140,2>
MS-4 Imager User's Manual
<K141>
and postamble
Communications
<K142>
character
3-5
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