Modem system
First Claim
1. In a modem system of the type having an RS232C interface and a modulator/demodulator connected for converting digital data in serial RS232C format to analog signals transmissble over the telephone network, the improvement comprising:
- an input-output circuit for connection to the parallel data port of an external data handling device;
converter means connected between said input-output circuit and said modulator/demodulator for bi-directionally converting between parallel and serial data format;
controller means for controlling the flow of data between said modulator/demodulator and said input-output circuit; and
means for selecting an operating mode whereby said modulator/demodulator is operatively connected to either said RS232C interface or said bi-directional serial-to-parallel converter means;
whereby bi-directional communication is selectable between the telephone network and either the RS232C interface or the parallel port.
0 Assignments
0 Petitions
Accused Products
Abstract
A modem system includes an RS232C interface; a modulator/demodulator; an input-output device having a parallel interface connected with a data terminal unit having no communication function or having a parallel specification; a parallel-to-serial converter for performing the mutual conversion between parallel data and serial data; a memory for temporally storing the transmitted or recieved data; and a controller for controlling the transmission and reception of data. The modem system can perform the convertion between RS232C specification data and centronix specification data such that a parallel specification printer or plotter having no communication function can be used as an output device for data transmitted to the modem system through the telephone network.
64 Citations
6 Claims
-
1. In a modem system of the type having an RS232C interface and a modulator/demodulator connected for converting digital data in serial RS232C format to analog signals transmissble over the telephone network, the improvement comprising:
-
an input-output circuit for connection to the parallel data port of an external data handling device; converter means connected between said input-output circuit and said modulator/demodulator for bi-directionally converting between parallel and serial data format; controller means for controlling the flow of data between said modulator/demodulator and said input-output circuit; and means for selecting an operating mode whereby said modulator/demodulator is operatively connected to either said RS232C interface or said bi-directional serial-to-parallel converter means; whereby bi-directional communication is selectable between the telephone network and either the RS232C interface or the parallel port. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification