hello guys i am new here, and i have a problem with the diagram to make a serial cable. ([Link: remotecentral.com])

what i have all: a stereo/2 conn 1,8 mini plug & a, 9 pol serial
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in the stereo cable are 3 cable. one black, one red, & one white. i thing the black is (GND), and the 2 others left & right. but how i now waht are the (RD) & (TD)

pls guys help me out! i need to connect my pronto tsu 6000 to my computer

sry for my bad e.l