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96 Glossary
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segment
The combination of: a continuous length of trunk cable connecting
a pair of taps; the two taps; and the drop cables between the two
taps and their node devices. One or more segments form a section
of the network. See section and tap.
serial port
An communication port at which data is transferred one bit at a
time.
slave
A networked device which is controlled by another device. Slave
devices do not initiate data transactions. They respond to
commands or requests initiated by a master device. See master.
slot time
The amount of time representing the worst case time any station
on the network must wait for a response from another station. It is
based upon the response time of the network's slowest station and
the bus propagation delay.
Specific Input
A type of data input received by a node using Peer Cop data
transfers. Nodes using Peer Cop can be configured to receive up to
32 16Ćbit words of Specific Input data from each of up to 64 source
nodes, up to a maximum total of 500 words. Nodes can be
configured to accept or ignore incoming data from specific source
nodes.
Specific Output
A type of data output sent by a node using Peer Cop data transfers.
Nodes using Peer Cop can be configured to send up to 32 16Ćbit
words of Specific Output data to each of up to 64 destination nodes,
up to a maximum total of 500 words.
splitter
A passive device that allows a cable to be routed into multiple paths
with essentially equal signal amplitude in each path. Not used with
Modbus Plus.
start delimiter
A field that defines the start of a frame, occurring after the signal
has been detected and synchronized by the receiving node. See end
delimiter.