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Glossary
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system
A set of hardware devices and their associated software capable of
performing the functions of information processing and device
control without significant dependence on other equipment.
tap
A passive electrical device that joins segments of the trunk cable, or
terminates the trunk cable at its two end sites. It also provides a
connection for the drop cable to the node device at the tap site. See
terminator.
terminator
A resistive load placed at the end of a cable to prevent data signals
from reflecting back into the data path. The signals are terminated
with the same impedance as the characteristic impedance of cable
system. On Modbus Plus, each tap contains a terminating resistor
with two jumpers. The termination is effective when the jumpers
are installed. The tap at each of the two ends of the cable section
has its terminating jumpers installed. The tap at each inline point
has them removed. See section.
token
In data transmission, a frame passed on a network that gives a
networked device the current authority to transmit.
token bus
A network access method between two or more devices in which the
procedure for sending data is based upon the passing of a token for
access to the network. See token.
transaction
The complete and successful transfer of a message between
networked devices.
trunk
The main element of the cable system that interconnects the
network nodes. On Modbus Plus, the trunk cable runs directly
between pairs of taps.