6
DMX signal connecting
PX781 have to be connected to DMX line in serial mode, with no branches
on DMX control cable. That means that DMX line, from the signal source,
must be connected to
DMX IN
pins of PX781 and later, directly from
DMX OUT
pins to the next device in DMX chain.
If the PX781 is the last DMX chain receiver there should be terminator
(resistor 120 Ohm) mounted between "
DMX+
" and "
DMX-
" pins of
DMX OUT
section.
DMX IN
DMX OUT
-
-
+
+
GND
GND
CORRECT
DMX-512 input
DMX-512 output
DMX IN
DMX OUT
-
-
+
+
GND
GND
WRONG
DMX-512 line
DMX IN
DMX OUT
-
-
+
+
GND
GND
TERMINATOR CONNECTION
DMX-512 input
120 Ohm
7
RDM – available parameters
The PX781 supports the DMX-RDM protocol. DMX protocol allows only of
a one-way data transmission, while its extension the RDM protocol can
transmit information in two directions. This makes possible to simultaneously
send and receive information, and hence the possibility of monitoring
activities of the compatible devices. Thanks to RDM some available settings
of compatible devices may be programmed using this protocol.
26
