Owner`s manual
1
The Model 24H Data Exchange System is a versatile, multi-function
data communication product that allows a single host computer system
such as an IBM PC to individually select up to twenty-three peripheral
devices (e.g., bar code readers, security systems, digital instruments,
etc.) and send data to the selected device. The Model 24H will
simultaneously multiplex incoming data from the peripheral devices to
be transmitted to the host system. The method of data transmission
from the peripheral devices to the host system is dependent upon the
mode of operation. The Model 24H features six user-selectable modes
of operation. The six modes of operation are described below.
Mode 1 Full Duplex Communication - Increases input/output
capabilities by allowing a single host computer to switch
between a maximum of twenty-three peripheral devices.
Provides bidirectional data transfer between the host
computer and the selected peripheral device.
Mode 2 All messages from all ports - Provides automatic
multiplexing of all messages from all peripheral devices.
Data is buffered until a terminating character is received
or until the buffer is full. The messages are then sent to
the host device preceded by a port identification code.
Mode 3 Single message from all ports - Same as Mode 2
(above), except that a single message is sent to the host
device from all peripheral devices upon request from the
host.
Mode 4 All messages from selected port - Same as Mode 2
(above), but with specific port selection.
Mode 5 Single message from selected port - Same as Mode 3
(above), but with specific port selection.