take a look a these pics, it might not be a wgr614 rev.5, probably a rev.8 or 9
but may be the same pin outs, you will have to compare the pics to yours
above the 12 pin block is a row of 6 pins, RX, TX, Gnd
wgr614 serial pin out

wgr 614 serial pinout

Red=RX (pin2)
Yellow=TX (pin5)
black=Gnd (pin6)

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