Black Box USB Single-Port Hub IC266A Especificaciones descargar pdf (Pagina 20)

APPENDIX B: Electrical Interfaces

Appendix B. Electrical Interfaces

RS-530

RS-530 (EIA-530) compatibility means that RS-422 signal

levels are met, and the pinout for the DB25 connector is

specified. The EIA (Electronic Industry Association)

created the RS-530 specification to detail the pinout,

and define a full set of modem control signals that can

be used for regulating flow control and line status. The

RS-530 specification defines two types of interface

circuits. Data Terminal Equipment (DTE) and Data

Circuit-Terminating Equipment (DCE). The USB

Single-Port Hub (RS-422/485) is a DTE interface.

RS-422

The RS-422 specification defines the electrical

characteristics of balanced voltage digital interface

circuits. RS-422 is a differential interface that defines

voltage levels and driver/receiver electrical

specifications. On a differential interface, logic levels are

defined by the difference in voltage between a pair of

outputs or inputs. In contrast, a single-ended interface,

for example, RS-232, defines the logic levels as the

difference in voltage between a single signal and a

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Black Box USB Single-Port Hub IC266A Especificaciones Pagina 20