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5.4 Enabling/Disabling auto switch
The auto switch functionality allows H
ERMES DXD to automatically connect an output to the other input
if there is no longer a sync signal on the input previous connected to this output. This functionality pro-
vides redundancy (inspite of a crash, there will be signal displayed on the projection modules), but
sometimes it might be useful to disable this behavior (e.g. to check if all sources connected to the input
are still ok).
Per default, every H
ERMES DXD leaves production with the auto switch functionality enabled.
The status of the auto switch functionality can be derived from the status register.
Command “j”: Enabling auto switch
Description: Via this command the RCM tells the RCS of class m to enable auto switch
The
RCS executes the command and sends the acknowledge which informs via the status
register about the auto switch status.
Example: The command
j is sent to the second RCS:
Message
<STX> <TYPE> <ADDRH> <ADDRL> <Body> <STATH> <STATL <CHKH> <CHKL> <ETX>
m0 2 j 39
case 1: auto switch was already enabled: nothing changes
case 2: auto switch has been disabled before and is now enabled
Since this command only affects the auto switch, the status of the inputs and outputs does
not matter and are assumed 1. The assumptions are written in italic. Then the status re-
gister looks like this:
Status Auto Switch Out2
true
Out1
true
Reserved Out2
target
Out1
target
Prsnt2 Prsnt1
1 11 0 1111
In both cases the acknowledge sent from the RCS to the RCM is the same:
Acknowledge
<STX> <TYPE> <ADDRH> <ADDRL> <Body> <STATH> <STATL <CHKH> <CHKL> <ETX>
m0 2 j ef04
Result: auto switch functionality is enabled.