User manual

COMMUNICATION PROTOCOL
C
109
C.2 DATA TRANSMISSION
The transmission of data from the Formula terminal towards the host computer
depends on the interface used.
C2.1 RS-232 and RS-485 Interfaces
Data transmission for both of these interfaces is virtually identical.
To receive and/or send data in this mode every unit of information must have the
following structure:
C.2.2 Eavesdrop Connection Interface
In this operating mode the Formula terminal will begin to transmit data contained in
the table to the host computer as soon as it is inserted into the cradle. This data is
not sent record by record but rather field by field. To do this, each field is changed
into a record before being transmitted. While this is being done the separators are
removed.
Let us imagine that the following record has been input to the terminal:
05/03/90 |15 :45| 88074329| 02|
Before being sent to the host computer it is broken down as shown below:
05/03/90 15:45 88074329 02
ATTENTION
This operating mode is not available for the F732 terminal.