Intermec Trakker Antares 2460, Руководство пользователя

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39
Operating the Terminal in a Network
4-27
4
About Network Connectivity and Protocols
The 246X stationary terminals are data collection terminals with network support. The
2460 and 2461 communicate with a host computer or other serial device through the
terminal’s serial ports. The 2461 communicates with a host directly through the
Ethernet network.
In a UDP Plus network, the terminal communicates through the DCS 300 to a host on
an Ethernet network. In a TCP/IP network, the terminal communicates to the host on an
Ethernet network.
The communications protocol stack for the 246X terminal is developed using the Open
Systems Interconnection (OSI) seven layer model. The illustration on the next page
shows how the Ethernet network and the serial ports map into the OSI model.
The terminal applications are on top of the protocol stack. Intermec provides a terminal
communications API (application program interface) to interface to the protocol stack.
The API provides a common interface to these Intermec value-added protocols:
•
Terminal Message Format (TMF) is an Intermec proprietary protocol that is used to
route data and network management messages between applications on the terminal
and peer tasks on the server or host.
•
UDP Plus is an Intermec protocol built on top of the User Datagram Protocol
(UDP). It maximizes the performance of Ethernet networks and provides robust
data communications.
•
Trivial File Transfer Protocol (TFTP) allows efficient file exchange between the
terminal and the DCS 300 or host.
•
Configurable Serial Port (CSP) protocol allows efficient file exchange between the
246X and the host through RS-232 and RS-232/422/485 (2460 only) serial
communications. The terminal uses either the
XMODEM
or
YMODEM
protocol to
transfer files via reader commands.
•
Network management provides network access to the terminal configuration, status,
and statistics. Network management uses the Terminal Message Format to receive
and send messages.
The remaining layers in the protocol stack are a series of standard protocols that
interface with the drivers and hardware needed to support the Ethernet network and
serial communications.