Like PERRYPJ said, LD 90, PRT the SPN or NXX involved, req=prt, cust=0 (or another appropriate customer number), feat=net, I don't remember the next prompt but the value expected is AC1 or AC2, type=SPN or NPA, and finally the you get to enter the problem SPN/NPA. Your machine will reply, and...
Paul,
It only looks like a serial connector. I don't remember the pin-out for the connection, but it contains two 2000 TN connections and a power pair. I would be amazed if the 2250 did anything meaningful to an RS232.
Scott
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