Still no luck with those settings PMCR. I have CX-one v1.11, and CX-Programmer is v6.11. The powersupply on my unit is a PA203, and only has one terminal for 120VAC hot. Could it be that the peripheral port has been configured for something no standard? I could make a rs232 cable and try connecting to the unit that way instead of using my CQM1-CIF02 cable. Also currently there is no lights illuminated on my cpu, although the com1 light does blink on occasion when attempting to connect. Dip switch settings are as follows: Memory Protect: on M/C Auto Read: off Message English: on Default instruction set: on RS232 fixed setting: on AR0712: off