Abstract: A tester for characterizing an Ethernet connection is provided. In one example the tester has a connector for coupling to an Ethernet port. The connector has a set of output lines connected to a selector. A controller configures the selector to selectively couple pairs of the output lines to a measurement circuit. Different pairs of output lines are measured to determine which, if any, of the pairs are powered. The tester may also characterize the type of power found. For example, the power may be an “always on” AC or DC power, or provided according to a vendor-specific handshaking sequence. In another example, the power may be compliant with a power standard, such as IEEE802.3af. In characterizing the power according to a particular power implementation, the tester may have to emulate handshaking or other expected responses according to the standard or vendor specification. The tester may also be constructed to characterize the power requirements for a powered Ethernet device.

Abstract: A metering system according to the invention may include a portable controller, a metering pump in communication with the portable controller and capable of receiving signals from the portable controller, and at least one process sensor in communication with the portable controller and capable of sending information signals to the portable controller. A method according to the invention may include providing a portable controller, providing a metering pump in communication with the portable controller, providing a process sensor that is capable of sensing an aspect of the process, and is in communication with the portable controller, communicating process information from the process sensor to the portable controller, communicating a control signal from the portable controller to the metering pump, and dispensing the substance from the pump to the process.

Abstract: A digital time domain reflectometer system is provided for performing a measurement process that is useful for calculating a cable length. The measurement process starts with a launch controller periodically generating a sync signal for turning a duration signal on. After a known delay time, the launch controller launches a signal on a cable, and if a reflected signal is detected, a detection circuit turns the duration signal off. A counter counts the number of clock pulses in the duration signal. This system is made more accurate by performing the measurement process multiple times and averaging the results. Using the averaged results, and compensating for the added known delay time, the cable length is calculated. An adaptive threshold may be used to enhance measurement accuracy.