RFDMX User Manual
Page
6
of
12
–
Version 1.3
–
Status
–
DRAFT
Document Number
–
PRJ-TXP-MAN-001
DIP switches Example 1
–
RFDMX set to receiver mode
DIP switches Example 2
–
RFDMX set to transmitter mode
2.4.2
Frame Hold (RX Mode only)
The Frame Hold feature monitors the DMX data frames being received from the TX unit.
With Frame Hold OFF, the received DMX data frames are regenerated and transmitted as they are
received. Should a DMX data frame be lost or corrupted due to electrical noise or other radio
interference, then the lost frame is skipped, causing an interruption in the DMX data stream.
Some lighting fixtures interpret a lost frame as complete loss of DMX data, and switch off
automatically. On return of the DMX data they resume normal operation. These events are usually
visible as a
‘
dip
’
or
‘
flicker
’
in the light fixture output.
With Frame Hold ON, the received DMX data frames are monitored. Should a DMX data frame be lost,
then a repeat of the last frame is automatically generated and inserted into the DMX data stream. The
data stream remains uninterrupted, and no visible
‘
dip
’
or
‘
flicker
’
occurs in the lighting fixture.
The Frame Hold feature will repeat the last frame up to a maximum of 30 frames, then will stop
regenerating DMX data. For most applications this corresponds to approximately 1 second.
Frame Hold is ideal for installations where existing RF communications systems are in operation, and
RF noise / interference is known to be present.