Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

152 Glossary
Glossary
RS-232-C The Electronic
Industries Association (EIA)
Level 1 protocol specification that
defines electrical circuit
functions for 25 connector pins.
HP provides two implementations
of this standard: a 3-pin version
for direct connections up to a
distance of 15 meters (50 feet),
and a version which makes use of
additional circuits and can be
used for either modem or direct
connections.
RS-422 The Electronic
Industries Association (EIA)
Level 1 protocol specification
implemented by HP in a 5-pin
version which can be used for
direct device connection up to a
distance of 1500 meters
(4000 feet).
S
security string An
alphanumeric character string
that functions as a password for
dial links. The security string is
used by the Dial IP protocol.
serial device Any device that is
attached to and communicates
with a computer by means of a
serial transmission interface.
Terminals, printers, and plotters
are among the devices that
communicate serially with
MPE/iX computers.
serial transmission A method
of transferring data in which
characters are transmitted one
bit at a time and received one bit
at a time in the order of
transmission. This transmission
scheme is employed by devices
connected to the MPE/iX systems
via the DTC.
session-accepting device A
terminal or personal computer
running in terminal-emulation
mode that is able to establish an
interactive (conversational)
session with an HP 3000
computer. Also referred to as a
logon device.
shared dial A dial link that
provides connection to more than
one remote system, although to
only one at a time.
shared-line access The feature
that allows two or more HP 3000
Series 900 hosts to use the same
DTC/X.25 Network Access card
on a DTC to access an X.25
network.
SIC Serial Interface Card. A
card installed in the front of the
DTC that acts as an interface
between a corresponding
Connector Card (CC) and the
DTC’s processor.
slaved device A device that
shares the same DTC port as
another device and is connected,
to the other device, referred to as
its master, by a cable. The actions
of the slaved device are controlled
by the master device.