Using A Plotter In An Environment With A Terminal - HP 7470A Interfacing And Programming Manual

placed in the on—line, p rogrammed-off mode. That operating state is
described under operation with a terminal.
Using a Plotter in an Environment with a Terminal
Installation
In the second type of system, the plotter is connected in series between
the computer and the terminal. The p1otter's LINE switch must be ONin
order to have any communication between the terminal and the com­
puter. There may be a direct wire between the computer and the plotter
or the plotter may be connected to a modem and communication may
take place over telephone lines. This setup, with the plotter between the
computer and the terminal, is sometimes referred to as eavesdrop
environment. A special Y-cable (Part No. 17455A),which joins the lines
from the computer and terminal into the plotter's one connector, must
be used in this environment. Diagrams of the two systems, with and
without a modem, follow, along with pictures of the rear-panel con­
nections for both kinds of systems.
SYSTEM DIAGRAM
COUPLER/MODEM TERMINAL
|— — REMOTE
COMPUTING FACILITY
PLOTTER
VPOWER
*' CORD
RS-232-C g = 17455/\
CABLE(SUPPLIED Z T CABLEPURCHASED FROM
By USER) \ HEWLETT-PACKARD
Plotter Interconnection with a Terminal and Remote Facility Using Modems
10-4 RS-232-C/CCITT V.24INTERFACING