31
W&T
RS232 Multi Computer Adapter
Subject to error and alteration
Transparent mode
The data sender that wants to send something first is
immediately connected to the serial terminal device. All data
received 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
second 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 data flow in this mode, but rather transparently
passes the received data from the sender to the respective
receiver. The terminal devices themselves must provide for
any required control of the data flow.
Setting the modes
The two modes of the device are selected and configured
using the DIL switch bank SW4. In addition to selecting the
operating mode, the switchover time for both mode types
can be set in fixed increments of 5, 15, 30 and 120 seconds.
For transparent mode you can also configure the timeout in
steps of 0, 30, 90 and 500 ms.
