Omron V440-F, Руководство пользователя

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Appendices
D-12 V440-F C-Mount Code Reader User Manual
D-5 Host Port Protocol
• Note:
In all protocol modes, the preamble
<K141>
and postamble
<K142>
character strings can be used
to frame the decode data, and both are included in calculating the
LRC
(Longitudinal Redundancy Check).
Usage:
In general, the point-to-point protocols will work well in most applications. They require
no address and must use RS-232 communications standards.
Definition:
Protocols define the sequence and format in which information is transferred between
the reader and the host.
Serial Cmd:
<
K140, protocol ,address
>
Default: Point-to-Point
Options: 0 = Point-to-Point
2 = Point-to-Point with XON/XOFF
4 = ACK/NAK
5 = Polling Mode
D-5-1 Point-to-Point (Standard)
Usage:
Used only with RS-232.
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
>
D-5-2 Point-to-Point (Point-to-Point with XON/XOFF)
Usage:
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). Requests a handshake from the host.
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.
Serial Cmd:
<
K140, 2
>
D-5-3 ACK/NAK
Definition:
See the
ACK/NAK Options
command
<K147>
.
Serial Cmd:
<
K140, 4
>
D-5-4 Polling Mode
Definition:
See the
Polling Mode Options
command
<K148>
.
Serial Cmd:
<
K140, 5
>
Poll Address
Serial Cmd:
<
K140, protocol, address
>
Default: 1
Options:
1 to 50
1 = Poll address 0x1C, Select address 0x1D
2 = Poll address 0x1E, Select address 0x1F
...
50 = Poll address 0x7E, Select address 0x7F