OVATION Westinghouse 5X00497G01 I/O Module

OVATION Westinghouse 5X00497G01 I/O Module

Technical data of product parameters

Another signal used in many systems is DCD. The original purpose
of this signal was to inform the system that the carrier tone from the
distant modem was being received. This signal is frequently used
by the software to display a message such as5X00497G01to
help the user diagnose failure to communicate. Obviously, if the
system is designed properly to use this signal and is not connected
to a modem, the signal must be provided by a pullup resistor or
gate as described above (see Figure A-1).
Many modems expect a DTR high signal and issue a DSR response.
These signals are used by software to help prompt the operator
about possible causes of trouble. The DTR signal is sometimes used
to disconnect the phone circuit in preparation for another automatic
call. These signals are necessary in order to communicate with all 5X00497G01
possible modemsFigure A-2 shows a way of wiring an EIA-232-D connector to enable
a computer to connect to a basic terminal with only three lines. This
is feasible because most terminals have DTR and RTS signals that
are ON, and which can be used to pull up the CTS, DCD, and DSR
signals.5X00497G01
Two of these connectors wired back-to-back can be used. In this
implementation, however, diagnostic messages that might
otherwise be generated do not occur because all the handshaking is
bypassed. In addition, the TX and RX lines may have to be crossed
since TX from a terminal is outgoing but the TX line on a modem is
an incoming signal.
Another subject to consider is the use of ground pins. There are two
pins labeled GND. Pin 7 is the SIGNAL GROUND and must be
connected to the distant device to complete the circuit. Pin 1 is the
CHASSIS GROUND, but it must be used with care. The chassis is
connected to the power ground through the green wire in the
power cord and must be connected to the chassis to be in
compliance with the electrical code.

Product picture display

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