Transparent Mode; Splitter Mode - W&T Rs232 Multi Computer Adapter Handbuch

W&T

Transparent mode

The data sender that wants to send something first is
immediately connected to the serial terminal device. All data re-
ceived on the other input of the T-switch are rejected as long
as the terminal device is connected to the first data
sender. Two conditions must be met in order to enable the se-
cond input:
: The first data source has sent no more data since a
settable switching time.
: No more data have been received on the second input
since a likewise configurable timeout time.
This mechanism prevents the input from being activated in the
middle of a protocol block and thereby a fragmented data
record from reaching the receiver.
In this mode the Multi Computer Adapter supports only the two
data lines RxD and TxD. The T-switch does not interfere in the
d a t a f l o w i n t h i s m o d e , b u t r a t h e r t r a n s p a r e n t l y
passes the received data from the sender to the respective re-
ceiver. The terminal devices themselves must provide for any
required control of the data flow.

Splitter mode

In this mode all data arriving at Port C are passed to Ports A
and B (C r A und C r B).
Data arriving at A and B are passed to C. Only one
communications line may however be active in this direction (A
r C oder B r C). The prerequisite for establishing such
feedback channel is that no data have arrived at the competing
port (B or A) since the set reverse time.
If feedback channel is open (A r C oder B r C), all data received
at the competing port (B or A) are rejected. Even is a feedback
channel active, data received at C are passed to A and B. The
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RS232 Multi Computer Adapter