Description; T A Transmission - GE TermiNet 300 Programmer's Manual

p,·og,·ammer~s
Manual
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Printer
INTRODUCTION
Although this nlanual is called a Progranllner's
Manual, it can also be called an application manual
or a systems engineer's rnanuaL The purpose of
this nlanual is to provide users \vith the detailed
characteristics of the General Electric TermiNet
300 Printer, which are necessary to inlplement
communications between the TerlniNet 300 Printer
and a computer-related system. Other Inanuals are
available concerning the TermiNet 300 Printer; these
are the Operator's Manual and the Service Manual.
Each of the other manuals is directed to serve a
different purpose but may be used as auxiliary in-
fornlation for the progranlnler.
It
is requested that
comnlents and/or suggested revisions for these
manuals be mailed to: General Electric Company,
East Side Highway ~Waynesboro~ Virginia 22980,
attention Technical Writer, Data C0111munication
Printer Marketing.
DESCRIPTION
The TermiNet
300
Printer (Fig.
1),
which will
be described as a keyboard printer only, can be
used with several devices. In Fig. 2, it is shown
on a desk console which includes a tape reader and
punch. It is not necessary to have both the reader
and punch; either one, or both, 111ay be used with
the keyboard printer. An empty drawer is placed
in the desk unit if one of these items is not ordered.
The keyboard printer is necessary, however, for
the operation of the reader and punch, as will be
Fig. 1. TermiNet 300 Printer
Fig.
2. T
ermiNet
300
Printer
on
desk console
seen later in this manual. The keyboard printer is
the controlling item and provides the interface to the
transmission circuit.
General Electric also makes a " receive only" ver-
sion of the TermiNet 300 Printer. Without a trans-
mitting capability or keyboard, this unit operates
essentially the same as the TermiNet 300 in the
receiving function and printout areas.
To understand the operation of the TermiNet 300
Printer, it is necessary to consider the logical lay-
out of the machine itself and how it performs its
work. Figure 3 shows a block di.agram of the op-
eratingfunctions of the TermiNet 300 Printer. This
manual does not contain a detailed explanation of
how operation is achieved; but if questions arise as
to the explanations given later in the manual, a re-
ferral to this block diagram may help clarify the
situation.
DATA TRANSMISSION
The TermiNet 300 Printer is an asynchronous
transmitting or receiving device. All transmitting
or receiving between the TermiNet 300 Printer and
any other device is carried on in serial form. Fig-
ure 4 shows, symbolically, the typical operation
when transmitting or receiving asynchronous data
in serial form.
The electrical interface bet ween the TernliN et
300 Printer and the comrnunication network is in
accordance with RS232B. There are nlany va riches
3