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FTID USB-COM232-PLUS4

2 - rxd
3 - txd
5 - gnd

modem :port A
db9 pin 2 <-> top right
db9 pin 3 <-> bottom middle
db9 pin 5 <-> bottom left 

freewave :port B
db9 pin 2 <-> solid blue
db9 pin 3 <-> striped blue

external/altimeter :port C
db9 pin 2 <-> bottom left (viewed from outside)
db9 pin 3 <-> bottom right