Doug Fleenor Design 2322DMX - Manual

Doug Fleenor Design, Inc.
RS-232 to DMX512 Interface, 2 Generation nd
March 8, 2010 (Software V1.2)
The second generation RS-232 to DMX512 interface has numerous features beyond
the original device. The protocol described in this document supports the new features.
The protocol described for the original RS-232 to DMX512 interface is not supported by
this device. The changes required to move to the new interface are minimal and are
described later in this document.
Connections
The RS-232 signals are available on the front panel DB-9M connector and on the 3 pin
female XLR connector on the rear panel. Please connect to only one of these ports.
You may not use the two ports simultaneously.
The front panel DB-9M connector pinout is:
Pin Number Function
2 Receive data
3 Transmit data
5 Common
The rear panel 3 pin XLR connector pinout is:
Pin Number Function
1 Common
2 Receive data
3 Transmit data
The male and female 5 pin XLR connectors are in parallel. When the interface is
configured for mode zero (DMX output), only the female output connector should be
used. When the interface is configured for mode one (DMX input), the external DMX
source should be connected to the male input connector. The female output connector
can be used to connect to other DMX devices. If the female output “thru” connection is
not used, a 120 terminator should be connected.
The pinout for the 5 pin XLR connectors is:
Pin Number Funciton
1 Common
2 DMX data minus
3 DMX data plus
4 connected from input to output only
5 connected from input to output only