Intermec Transaction Manager 9560, Руководство пользователя

Страница: 77 / 309

Data Communications and Operating Options
5-3
5
This chapter provides a general overview of data communications and 9560 operating
options, such as display settings. For more details, refer to Intermec’s Data
Communications Reference Manual.
Introduction to Data Communications
Your bar code equipment and data processing equipment (the host computer)
must be able to understand and exchange data quickly and accurately. Data
communication standards and protocols spell out exactly how data is to be sent
and received. This section briefly explains the standards and protocols
common to data collection systems.
Data Communications in a Data Collection System
The main purpose of bar code data collection is to get data from the warehouse,
the shop floor, or the factory to a central database quickly where the
information can be processed. To do this, numerous devices transmit and
receive data:
• The host computer sends bar code label formats to a bar code label printer.
• The host computer sends data collection programs through a network
controller to the 9560 and other bar code readers.
• The readers transmit the data collected back to the host computer through a
network controller.
The ISO Data Communications Model
All Intermec equipment follows the standards established by the International
Standards Organization (ISO) to describe the data communications process.
The ISO model describes seven, sequential, autonomous layers. For example,
the lowest layer, called the physical layer, describes cable connectors, basic
signaling, and signal levels used in data communications.
The physical layer and the data link layer are the largest layers used by
Intermec equipment. For more information on the ISO model and other layers,
refer to Intermec’s Data Communications Reference Manual.