Extron Electronics MLC 104 Plus Series - Manual (Page 133)

5-29 MLC 104 Plus Series • Special Applications
PRELIMINAR
Y
Controlling a Second Projector/Display
If an installation doesn’t require additional inputs or an audio amplifier, you
can use the MLS port and RS-232 serial communication to control an additional
projector or display.
Connecting the second projector/display
Wiring varies depending on the projector/display model. In most cases the drivers
are bidirectional, but sometimes only the transmit (Tx) and ground connections are
needed for projector/display control. For bidirectional RS-232 communication, the
transmit, ground, and receive pins must be wired at both the MLC and the projector
or display. Use the diagram below as a guide.
MLS port’s RS-232 protocol:
• 9600 baud
• 8 data bits
• 1 stop bit
• no parity
N Each projector or display may require different wiring. For details, refer to
the manual that came with the projector/display or the Extron device driver
communication sheet.
N Maximum distances between the MLC and the device being controlled may vary
up to 200 feet (61 m). Factors such as cable gauge, baud rates, environment,
and output levels (from the MLC and the device being controlled) all affect
transmission distance. Distances of about 50 feet (15 m) are typically not a
problem. In some cases the MLC may be capable of transmitting and controlling
a given device via RS‑232 up to 250 feet (76 m) away, but the RS‑232 response
levels of that device may be too low for the MLC to detect.
Configuring the MLC for a second projector/display
Configuration involves setting up a driver for the MLS port and then setting up the
Display On button to control the main projector/display and setting up the Display
Off button to control the display/projector connected to the MLS port.
To configure the MLC to control a second display or projector, perform these steps:
1. Start the Global Configurator software and open a project that includes an
MLC 104 Plus Series controller.
Connecting an MLC 104 Plus Series controller
to a second display/ projector
NOTE You must connect a
ground wire between the
MLC and the display.
NOTE If you use cable that has a
drain wire, tie the drain
wire to ground at both ends.
Ground ( )
Transmit (Tx)
B Receive (Rx)
A
Transmit (Tx)
Receive (Rx)
B
A
MLS
RS-232
GR
OU
ND
A B
Tx R x
To
Display/
Projector