Homebrew PCBs

>
>  Here is an ascii version of the wiring diagram for each standard
>  DCE     to     DCE
>               or
>  DTE      to     DTE
>  1____________1
>  2_____     ____2     This is a crossover cable (sounds like you are using this cable)
>  3_____ X ____3
>

emm, no ground ?

Ok I'll try connecting pin1 to pin1, and with/without ground.

As to crossover 2-3 3-2, that wont work, it needs 2-2 and 3-3 this has
been proven by the dongle with led's

When I plug the dongle into the plotter the led on TxD goes green, the
led's on RTS and DTR go red, Idont know what the different colours
mean, but it gives me a clue as to what lines are actually connected.

You notice thats its the TxD led that lights up, not RxD, so I swapped
the wires on my cable so when I plug it into the dongle it lights up
the RxD light, with the cable plugged into the dongle and also into
the plotter, both RxD and TxD lights are green.
When I send data the RxD(pc) led flashes, the TxD(plot) does not change.





Lez