Visual Productions IOCORE, Manual, Page: 9 / 58

2.2 GPO
Each GPO port features a normally-open (NO) relay for switching external
equipment. The relay can switch 250VAC/30VDC up to 2A. Please refer to
figure 2.2 for the pinout of the GPO connector.
Figure 2.2: GPO Pinout
2.3 RS-232
The bi-directional RS-232 port can be used to communicate with external equip-
ment such as video projectors and matrix switchers. Figure 2.3 shows the pinout
of the connector which shared with the DMX port. Please refer to page 36 for
more information on configuring the RS-232 port.
Figure 2.3: RS-232 Pinout
2.4 DMX-512
DMX-512 is the standard communication protocol for stage lighting. Its official
name is E1.11-2008 USITT DMX512-A. Nowadays the reach of the DMX proto-
col has extended beyond entertainment lighting and is also used for architectural
lighting. Originally one DMX network contained 512 channels which is called a
’universe’. With the growing size and complexity of lighting systems it is now
very common for a system to compose of multiple universes, each conveying 512
channels. It is advised to use a shielded twisted pair cable for DMX cabling.
The cable should be terminated with an 120 Ohm resistor.
DMX-512 is a very successful protocol with, however, a few limitations. The
maximum number of attached devices is limited to 32 and they all have to be
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