Browse Prior Art Database

Frequency Burst Transmission Data Collection System

IP.com Disclosure Number: IPCOM000096173D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Barr, JE: AUTHOR [+4]

Abstract

The system has a nine-wire, short distance transmission device connecting each of a plurality of remote terminals. There is a remote control unit in which the received data is serialized and then transmitted over a pair of telephone lines to a central computer. The remote terminals consist of sensed magnetic badge readers, keyboards, and static AC sensed card readers. The heart of the system is the remote control unit RCU.

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Frequency Burst Transmission Data Collection System

The system has a nine-wire, short distance transmission device connecting each of a plurality of remote terminals. There is a remote control unit in which the received data is serialized and then transmitted over a pair of telephone lines to a central computer. The remote terminals consist of sensed magnetic badge readers, keyboards, and static AC sensed card readers. The heart of the system is the remote control unit RCU.

The RCU contains a 100 kc free running oscillator. This can be gated to one of two lines terminating in the terminals and pulsing a master timer that generates the system pulse times. The system timed pulses are broken down into five two-millisecond sub-cycles each containing 200 A.C. cycles of 100 kc frequency identified as P, Q, R, S and T which forms a digit time.

The timer comprises a multi-stable core counter divider circuit generating various outputs. For a data character P and Q are sense character times, R and S are serialize and modulate time, and T is character separation time. For a control character P, Q and R is off time, S and T the on control time. At P and Q time of the first character time, a 400 cycle frequency burst is placed on a data control line which terminates in the remote terminals magnetic character scanner primary winding.

The secondary winding couples the frequency burst to the first character in the badge reader, keyboard and card reader where it is coded into a b...