Why do I Need to use a Hub When Communicating With the Instrument via Ethernet?
To avoid the noise and communication disruptions, it is our recommendation to the customer to use a HUB when communicating to the instrument via Ethernet. The HUB will provide a very strong GND connection and eliminate most of the noise problems. HUBs are designed to provide a reliable and high quality communication/data transfer connection over an Ethernet at high speeds.
In the US, most AC adaptors for PC and PC power connections are 3-pin, and have a GND connection. If the PC and the instrument are both well grounded, then there is no problem in using a cross-over cable to connect directly to our instrument. Since we don't know if there is a good GND connection in the customer's PC, we generally recommend using a HUB when connecting to the instrument via Ethernet.
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