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Help with understanding pinout on circuit board Answered

I'm an HVAC technician and at school they had a bunch of Carrier EMI thermostats that connect to a router with a module. I'm pretty tech-savvy, but I'm not the greatest when it comes to wireless technology. On the board there are spots labeled: Tx, Rx, A2D2, GNDs, GNDp, and 12vdc. Then there are another 2 labeled OAT and OATC. What do these all mean? All I know is that Tx and Rx are transmitting and receiving. Any help is much appreciated.

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musick_08 (author)2013-05-08

I think oat and oat stand for outdoor ambient temperature (maybe thermometer), and outdoor ambient temperature control

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qquuiinn (author)2013-05-08

GND and 12 volt is ground and 12 volts source. GNDp is PLL ground signal line and i guess GNDs is just common ground.

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musick_08 (author)qquuiinn2013-05-08

Makes sense to me, I never heard of PLL before

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musick_08 (author)2013-05-08

I just came across a page that's saying the thermostat connects to the internet via a 2-way paging module.

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steveastrouk (author)2013-05-08

Got a reference to the installation manual ?

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musick_08 (author)steveastrouk2013-05-08

Unfortunately no, all I have is the module and the thermostat. I even called carrier and they wouldn't help me out.

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