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3.3.1 Signal transmission
The signal received at the input interface (Rx connection) is transmitted to the down-
stream devices at all three output interfaces (Tx connection).
In the opposite direction, DIP switches may be used to select which of the data re-
ceived at the output interfaces (Rx connection) must be transmitted to the Tx connec-
tion of the input interface.
The user himself is responsible for the prevention of collisions on the backward chan-
nel. In order to do this he must either activate only the backward channel of an output
interface or ensure by appropriate protocols that at all times only one of the connected
devices attempts to communicate with the superior device.
3.3.2 Bridge mode
With the two DIP switches "Bridge Rx In +" and "Bridge Rx In -", the incom-
ing signals of both input interfaces can be connected to each other.
If both incoming signals are connected to each other, the device works as a
1:6 distributor. In this operation mode, the data received at one of the two input inter-
faces is transmitted to all six output interfaces.
The backward channel is not bypassed. Thus only responses from the three output in-
terfaces that are part of the input interface used can be sent back to the superior de-
vice.
If a particularly high number of outputs are necessary, the unused input interface can
be directed as cascading output straight to another serial distributor.
3.3.3 Monitoring and alarm system
The Tx signal of each output interface is compared with the Rx signal of the corre-
sponding input interface. If a discrepancy is detected, for example because the output
contains a short-circuit, an alarm is activated, which in its turn activates the alarm LED
and the alarm relay.
3.3.4 Display
The status of both input interfaces is shown on the front of the distributor by means of
their Rx LED and Tx LED. The status of each output interface is shown on the back of
the case by means of their Rx LED and Tx LED.