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DCS 300 User’s Manual
8-12
The server NetComms use the TCP/IP socket API to provide a standard interface to
TCP/IP Transport and Internet layers. The API supports the “streams” socket-type
interface, which is a reliable, connection-oriented service. When data is sent, the
transmission of the data packet is guaranteed and it is received in the same order as it
was sent. Built-in flow control avoids data overruns. No boundaries are imposed on the
data; it is considered to be a byte stream.
The NetComms are server applications that issue passive open commands to accept
connections from remote applications. The server mode send and receive NetComms
are each started as a single process that receives requests from remote applications for
both send and receive server connections respectively.
Each NetComm can handle a maximum number of connections before spawning off an
identical process to handle any new connections. You set the maximum number of
connections in the Max connections field in the System Parameters dialog box.
This figure shows a typical client/server configuration using sockets. Server 1 runs on
Host 1 and Client 1 runs on Host 2. Server 1 listens on a socket that uses IP. Each
socket is identified by a socket address, which is a data structure that specifies the
address family, network address, and port number.
Address Family: IP
Network Address: 192.5.7.9
Host 1
Host 2
0300U.029
Socket
Socket
APP 1
UDP
TCP Port 4400
APP 2
UDP
TCP Port 4401
Address Family: IP
Network Address: 192.5.7.10
Address family
Also called the protocol family. The address family determines the
communications protocol used to deliver the transaction and the structure of the
addresses used to represent the end point of the communication.
Network address
Along with the communications protocol, the network address value
uniquely identifies a host on one or more interconnected networks.
Port number
This value specifies a communication end point within the host. The
port numbers are 4400 for the send connection and 4401 for the receive connection.
For an application to become interactive with the DCS 300, it must have a send and a
receive connection.
•
The send connection sends data to the DCS 300.
•
The receive connection receives data from the DCS 300.
Содержание DCS 300
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Страница 135: ...Connecting to the 9180 and the Intermec CrossBar Network 5 ...
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Страница 159: ...Running Data Collection Browser 6 ...
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Страница 259: ...Running Screen Mapping 10 ...
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Страница 269: ...Running Screen Mapping 10 11 10 Screen 3 Screen 4 Main Host Screen Screen 5 ...
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Страница 333: ...Troubleshooting 11 ...
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Страница 373: ...Specifications and Other Helpful Information A ...
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Страница 391: ...Upgrading the DCS 300 and Devices B ...
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Страница 411: ...How the DCS 300 Routes Transactions C ...
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Страница 431: ...Index I ...
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