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MDR-2000 VJ User's Reference Manual
Communications
Chapter
4
COMMUNICATIONS
The purpose
of
this section is to describe the commands and protocols used to control and
communicate with the MDR-2000. Commands are necessary to operate the MDR-2000, while the
protocols are used to ensure data integrity over transmission lines.
The MDR-2000 supports a two level command structure. The first level, described here, is used
primarily for computer-to-computer communications. The commands are structured to enable the
MDR-2000 to transfer large volumes
of
call data to a host computer for downstream processing.
The second level
of
commands is implemented in the Interactive Monitor and these commands are
designed for human interaction. The commands are structured to provide remote operation and
diagnosis
of
the
MDR
-2000. The Interactive Monitor is described in Section 5.
4.1
Computer-To-Computer
Commands
The MDR-2000 operates over full duplex lines at speeds up to 19200 Baud. This full duplex capa-
bility is essential for remote control
of
the MDR-2000. Commands to the MDR-2000 are used to
specify a single operation to be performed by the unit.
Commands utilize a very simple protocol when being transmitted to the MDR-2000. Each
command is preceded by a SYN (ASCII 16H, or Control-V) character and terminated by a carriage-
return (ASCII
ODH).
The commands themselves are all two characters long.
Commands partially entered in error can be eliminated by simply typing the SYN character fol-
lowed by the correct command. The normal keyboard editing characters such
as
Delete or Back-
space have no meaning. The command does not echo on the user's terminal. This is consistent
with the operation under program control, which is the normal case.
The computer-to-computer commands are as follows:
BE
- The 'BEgin' command moves the buffer pointers to the beginning
of
the current data storage
buffer. This command must be used with caution since it may result in duplicate data in the
downstream processing facility. There is no reply from the MDR-2000 to this command.
4-1
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