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

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placed in the on-line, programmed-off mode. That operating state is
described under operation with a terminal.
sing a Plotter in an Environment with a Terminal
installation
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In the second type of system, the plotter is connected in series between
the computer and the terminal. The plotter's
LINE
switch must be ON in
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
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REMOTE
COMPUTING FACILITY
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1U-4 RS-232-C/CCITT V.24 INTERFACING
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COUPLER/MODEM TERMINAL
REAR PANEL CONNECTIONS
RS-
2
3
2
-C V
CABLE (SUPPLIED
BY USERf
POWER
CORD
17455A
CABLE PURCHASED FROM
HEWLETT-PACKARD
Plotter Interconnection with a Terminal and Remote Facility Using Modems
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SYSTEM DIAGRAM
r
i
T E R M I N A L
REMOTE
COMPUTING FACILITY
HI
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REAR PANEL CONNECTIONS
17455A CABLE
PURCHASED FROM
HEWLETT-PACKARD
PLUG IN RS-232-C
CONNECTOR FROM
T E R M I N A L HERE POWER CORD
Plotter Interconnection with a Terminal and Remote Facility
Using RS-232-C/CCITT V.24 Cabling
RS-232-C/CCITT V.24 INTERFACING 10-5