Bridge Plus
A Modicon device that interconnects two Modbus Plus networks
broadband
A network communications method supporting multiple data transmission channels, using frequency division multiplexing
bus
An electrical channel used to send or receive data
carrierband
A network communications method in which information is transmitted using a single transmission channel See broadband
channel
The communication pathway between two or more devices
coaxial cable
A two conductor cable in which an inner conductor is the signal path and an outer conductor is a shield A dielectric separates the two conductors
Co-Processor
ridge Multiplexer models M85S232 and M85S485 These models contain a user0defined application program that can independently control processes at their four serial ports, accessing Modbus Plus nodes only as required
CRC
yclic Redundancy hecking An error detection method in which a sending station computes a mathematical value derived from the frame's contents, and sends it as an HDL field in the frame The receiving station recomputes the value as it receives the frame, and compares it to the received value If the two values are equal, the frame is assumed to have been received without error
data frame
An LL frame containing data to be transferred between devices
Data Link Layer
In the OSI model, the layer that provides services for transferring frames of data between nodes of a network Defined by the I
8022 standard At this layer, a sending device assembles data into a message packet with addresses and information for error checking, handles tokens for accessing the network, and sends the packet to the Physical Layer for transmission Its two logical entities are the MA and LL sublayers See MAC and LLC
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