Ive got a 37" Mitsubishi TV that has a "brainbox" that it connects to which controls the TV, and other devices you connect to it.
It communicates with the TV via 2 cables:
HDMI --male - male
"Monitor link cable" (rs-232) (female to female db-9)
I am wondering if this monitor link cable is a null-modem cable b/c I need to snake it through my wall and plan on making an ethernet conversion cable.
I have called the manufacturer & tweeter and they told me it was a "special" cable exclusive to the model of my TV. They also told me that the 25 ft. HDMI cable I got from Ebay for $30 was going to cost $400 thru them.
Anyone have any experience with this stuff? B/C in my A+ studying I've learned that female to female is always null modem. So I am confused.

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