Exchange/RJE Manual

1 Introduction
104698 Tandem Computers Incorporated 1–1
Exchange/RJE provides byte-synchronous, batch-oriented communications between
Tandem systems and remote systems. The major features of Exchange/RJE are the
following:
Data communications using Binary Synchronous Communications (BSC) protocols
Command-interpreter and application-program (programmatic) interfaces
IBM 2780 Data Transmission Terminal emulation
IBM 3780 Data Communications Terminal emulation
Block-mode operation to transfer large blocks of data
Device-independent file access for sending and receiving files of any type
supported on Tandem systems
By using Exchange/RJE, a Tandem system can communicate with almost any
computer (or other communications device) that supports remote job entry (RJE) using
BSC protocols over switched or nonswitched (leased) lines.
Exchange/RJE
Components
Exchange/RJE is composed of the following components:
The command interpreter
The send/receive server
The line server (and the default user library)
The trace server
Each of these components is introduced in the following sections.
The Command Interpreter The Exchange/RJE command interpreter provides a command-driven interface that
allows access to all the communications capabilities of Exchange/RJE. Using the
command interpreter, you can emulate a 2780 terminal, emulate a 3780 terminal, or
perform block-mode operations to transfer files to and from a remote system.
You start the command interpreter with the RJECIR command. You can then enter
commands interactively, or you can execute a sequence of commands stored in a file
(which provides a way to automate repetitive tasks).
The command interpreter cannot be run as a NonStop process pair. If you require
communications using Exchange/RJE in a NonStop mode, you must use the
programmatic interface and program your own NonStop process pair to control the
communications. The command interpreter has no programmatic interface.
The Send/Receive Server The Exchange/RJE send/receive server is used by the Exchange/RJE command
interpreter to send and receive files. The command interpreter starts and stops the
send/receive server automatically as required. The send/receive server has no user
interface; you do not use it directly. Like the command interpreter, the send/receive
server cannot be run as a NonStop process pair.