Data network interface module with circuitry for disconnecting a

Details Data network interface module with circuitry for disconnecting a Data network interface module with circuitry for disconnecting a

1985-12-05

1987-07-14

Schreyer, Stafford D.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 69G, H04L 2502, H04B 344

Patent

active

046804315

ABSTRACT:
The invention relates to an interface module for the bidirectional transmission of data streams in a data network with separate power supplies for the individual bus stations. According to the invention, means are provided for bridging the bus station, preferably via normally closed contacts of a relay connected to the supply voltage and for simulating the ready condition if the power supply in the interface module fails. The latter consists of an OR circuit which is supplied on the one hand, via an operational amplifier and an RC section, with a constant delay and, on the other hand, via an optical coupler taking off the input signal, and a Schmitt trigger connected thereto.

REFERENCES:
patent: 3581075 (1971-05-01), Mattsson et al.
"Bus-fahige Schnittstelle nach RS 485/422", by Ing.(grad.) Hans-Peter Abendroth, Elektronik, Jun. 15, 1984, pp. 97-98.

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