hallo , i have problem with a lathe retrofit with a sinumerik 805 plc , the machinery was inactive for long time , and battery was lick acid, now i repleaced battery but at start coming out a error 2 (operator keyboard error) and i can not restore program to ram, i dont have a original siemens operator keyboard attached on rs 232 but a factory operator panel keyboard attached on input bit down left of the mainboard, and with this keyboard is not possible restore program machine, i ask if is possible attach a AT pc keybord with rs232 converter on plc for restore a program ?? or if exit another chance with out buy a epensive operator keyvoard form siemens. tank in advance Maurizio