User guide

MDX-ETHERNET User Guide 55
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Gateway : A device that allows devices on different subnets or networks to
communicate with each other.
Grounding : Describes the electrical safety or shielding connections for the module.
Hub : A method of connecting computers together on Ethernet. An un-switched hub will
repeat any data received on one port to all ports.
HTTP : Hypertext transfer protocol. This is a document specification protocol.
Commonly used in web pages.
Implicit data : See Cyclic data.
IN data : Data that is returned from a slave device to the ethernet master.
IP : Internet Protocol, this is the protocol used to transmit bytes across an IP network.
IP address : An address that identifies a node uniquely on a subnet or network.
IP subnet : A part of an IP network that consists of a range of addresses that may be
accessed by all devices on the same network directly.
LED : Light Emmiting Diode.
Long word : A 32 bit data word that may be signed or unsigned.
LSB : Least Significant Bit/Byte.
Master : The controlling device on the network, generally this will include programming
features.
MAC address : This is a unique address that is assigned to MDX-ETHERNET at the
time of manufacture. No other device will have this address. The address is used to
make connections to the module before the IP address is assigned.
MBAP : Modbus application protocol. This is a 7 byte header added to the main
Modbus telegram (PDU) which contains IP specific identifiers.
Modbus IP : A protocol that allows Modbus to be sent over TCP/IP. The modbus
protocol allows manipulation of the parameters within the host drive and MDX-
ETHERNET.
MSB : Most Significant Bit/Byte.
Network Loss Trip : A way to determine when a node has lost contact with the master.
Node : A device on the network. This may be either a device such as a drive or part of
the network such as a repeater.
Non-Cyclic Data : Data that is requested or sent by the master as required. This is not
sent on a regular basis and generally allows access to any parameter. This is useful for
occasional changes or configuration purposes.