Abstract: A device has a host port, a remote terminal (RT), an incoming line driver, an outgoing line driver, and at least one of an incoming message filter and an outgoing message filter. The host port communicatively couples to a shared host bus. The RT port communicatively couples to the RT. The incoming message filter receives an incoming host message from the host port and generates a filtered host message from the incoming host message employing at least one host message rule. The outgoing message filter receives an outgoing RT message from the RT port and generates a filtered RT message from the outgoing RT message employing at least one RT message rule. The incoming line driver communicates the filtered host message to the RT port. The outgoing line driver communicates the filtered RT message to the host port.

Abstract: An apparatus and system for repositioning heavy loads. Apparatus features an operator handle capable of positioning a lifting tongue under a load to be repositioned. The apparatus further features a set of motor driven wheels that engage the floor or other surface with the aid of friction or other traction means to propel the load forward or backward. Downward pressure on the operator handle while the lifting tongue is positioned under the load increase the motor driven wheels traction. The system further features rolling elements integral to the floor to further aid repositioning of the load as well as mechanical engagement means between the motor driven wheels and the floor where adequate friction between the same is not possible. The apparatus further features an addition set of unpowered wheels that may be alternately repositioned for engagement with the floor so as to lift the motor driven wheels out of contact with the floor to aid in orienting the apparatus with the load.

Abstract: A device has a host port, a remote terminal (RT), an incoming line driver, an outgoing line driver, and at least one of an incoming message filter and an outgoing message filter. The host port communicatively couples to a shared host bus. The RT port communicatively couples to the RT. The incoming message filter receives an incoming host message from the host port and generates a filtered host message from the incoming host message employing at least one host message rule. The outgoing message filter receives an outgoing RT message from the RT port and generates a filtered RT message from the outgoing RT message employing at least one RT message rule. The incoming line driver communicates the filtered host message to the RT port. The outgoing line driver communicates the filtered RT message to the host port.