Interface Description - Telebit WorldBlazer User Manual

Interface Description B
RS-232 Interface
Note:
90257-01
Communication between the modem and the local DTE is
accomplished through a 25-pin RS-232 connector.
The RS-232 standard is a set of specifications developed
by the Electronic Industries Association (EIA) that
applies to the transfer of data between the DTE and DCE.
It is the most common DTE-DCE interface in use in the
United States and is compatible with the International
Telegraph and Telephone Consultative Committee
Recommendation V.24 and Y.28.
The RS-232 standard covers three specific areas:
• The electrical and mechanical characteristics of the
interface
• The function of each interchange circuit
• Standard subsets of interchange circuit for specific
communication system applications
A DB-25 connector is required with the RS-232 interface.
Table B-1 lists the RS-232 interchange signals and their
associated pins.
RS-423 drivers are used through the DB-25 connector to
emulate RS-232 functionality between the WorldBlazer
modem and the DTE interface.
Interface Description 8-1