Doug Fleenor Design 2322DMX - Manual (Page 6)

The mode selection is stored in non-volatile memory and will be recalled on power up.
Query for information
The ‘?’ (query) command is used to request status information from the interface. The
current level of a specific channel can be requested. When the query number is in the
range of 1-512, this command will be triggered. The command format is:
? ###
For example:
? 451
In this example, the interface would return the current level of channel 451 in the
format:
C451@??? (where ??? is the decimal level for the channel)
Sending a query for channel 0 will cause the interface to respond with the current levels
for all 512 DMX channels. For example:
? 0
In this example, the interface would return the values for all channels in the format:
C001@??? (where ??? is the value for the channel)
C002@???
...
...
C512@???
Note that all channel level queries can be used to determine the level of DMX being
sent by the interface in mode 0 or of incoming DMX levels while in mode 1.
Sending a query for ‘P’ will cause the interface to respond with the currently active
preset. For example:
? P
Note that if a channel level has been changed after a preset has been recalled, the
preset number reported will be preset 0. This indicates that the levels are not
representative of any recorded preset.
In this example, the interface would return the number of the active preset in the format:
PRESET ##
Setting the heartbeat
The ‘H’ (heartbeat) command is used to select whether the heartbeat is on or off.
When enabled, a period “.” is sent from the interface every 1 second to allow a control
system to detect that the interface is connected. Setting the heartbeat equal to 1 turns
the feature on. Setting it to 0 (the default) turns the feature off. The format for this
command is: