Connecting to Comdial Impacts (including DXP/DXP+ to release 9) is done with any terminal emulation program. The larger Impact DSU's, DXP's have Data ports. On smaller DSU's, the Data port must be wired to a jack. DXP's past release 9 require VMMI, a Comdial proprietary program.
If the DSU has no port on the cabinet, connect a jack to the yellow/brown and yellow/slate pairs of the station cable. Green to yellow/brown, Red to brown/yellow, Black to yellow/slate, Yellow to slate/yellow.
Make a 9-pin EIA adapter (female) for the laptop serial port. This takes a STANDARD telephone base cord (not patch cord), 4 wire. Connect pin 2 of the RJ14 to pin 5 of the EIA. Connect pin 3 of the RJ14 to pin 3 of the EIA. Connect pin 4 of the RJ14 to pin 2 of the EIA. Connect pin 5 of the RJ14 to pin 8 of the EIA.
Go to extension 10. Press "Intercom *#746* 15 1 08 11 * Speaker". This will set the baud rate at 9600 n 8 1 on Data port A.
Connect your laptop to the system (port A or the jack you wired, depending on the system). Start Procomm or Hyperterminal or whatever terminal emulation program you use. Set the laptop serial port for 9600 n 8 1 and none handshake. Log in by hitting enter (it should say "Input Password"

and typing I*746* enter. The programming is fully menu driven from this point on.