User`s manual

Getting Started
2
This chapter explains how to prepare your 8500 series display terminal
Asynchronous Data Module (ADM) for data operations and how to make
data calls.
Communicating with the 8500 Series
Display Terminal ADM
You can ‘‘talk’’ to the 8500 series ADM through an attached data terminal or
personal computer by means of commands typed on the keyboard of the data
terminal or PC. There are two types of commands that can be used to talk to the
ADM: CMD and AT. CMD is the preferred method of talking to the ADM.
However, if you have a PC and you are using a communications package, you
may need to use AT commands because that may be the only command form
the package understands. A more detailed explanation of these commands can
be found in Chapter 3, ‘‘Using the CMD and AT Commands.’’
To use the commands, you must be communicating directly with the ADM in
what is called ‘‘local mode’’ (Figure 2-1). In local mode, characters entered at
the data terminal or PC keyboard are read, interpreted, and acted on by the
ADM. This is in contrast to the ‘‘data mode,’’ in which the ADM passes data from
your data terminal or PC to your host computer or other data endpoint.
2-1