3780 Bisync RJE Communications

3780 Bisync RJE Communications


This primer on 3780 Bisync RJE is provided by Serengeti Systems, makers of 3780Link. 3780Link provides complete 3780 Bisync RJE emulation for Windows and works with many EDI, EFT and ACH hubs including WalMart, ADP and Target. For more information, send us an e-mail or go to our web site.

Many applications use 3780 Bisync today including:
  • EDI, Electronic Data Interchange
  • EFT, Electronic Funds Transfer
  • ACH, Automated Clearing House
  • POS, Point of Sale terminals
  • ATM, Automated teller machines
  • Credit card authorization and processing
  • Insurance claims processing
Some of the companies that depend on 3780 Bisync to communicate with their vendors and customers include WalMart, ADP (Automatic Data Processing), Putnam Investments, Fidelity Investments, Target stores, K-Mart, Synovus, Sears, Roadway, ACE Hardware, Harris Bank, MBNA, NFCS, Ceridian, Blue Cross/Blue Shield, Aetna, AgriBank, Visa, MasterCard, Fireman's Fund Insurance and many more.

Back in the 1960s and 1970s, IBM manufactured a family of data communications terminals that were designated Model 2780 and Model 3780. These were batch or remote job entry (RJE) data terminals -- namely the IBM 2780 Data Communications Terminal and the IBM 3780 Data Communications Terminal. These terminals used punch cards and consisted of a card reader, a card punch, and a line printer. They used the binary synchronous communications protocol (shortened to bisync and or the acronym BSC) to transmit and receive data to and from an IBM mainframe computer. A terminal usually connected over dial-up or leased lines, originally at 2400 bps using Bell 201C modems, later at 4800 bps using Bell 208B modems, and most recently at 9600 bps or faster using V.32 and V.34 modems.

IBM 3780 RJE Terminal. Click for a larger view. While it is true that IBM 3780 and 2780 terminals are museum pieces today, the underlying bisync protocol became the defacto standard file transfer protocol for a wide array of computing devices in the 1970s and 1980s. If you needed to get a file from one machine to another during that time, very likely one or both would emulate 3780 RJE terminals to do so.

Today's 3780 bisync implementations include modern GUI-based interfaces, script interpretors to support unattended data transfer, and application program interfaces (APIs) for programmatically controlled data transfer.

Clearly, while 3780 bisync RJE communications is a bit long in the tooth, it is still widely used today and is an integral component in the world's computing infrastructure.
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Site last updated 6/3/2004