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I have a burford ttp-1 printer connected to a laptop computer on a nine pin serial port and sometimes it connects to the printer and sometimes it will not. The software program goes thru all the baud rates and parity and data bits and stop bits and com1 and com2. How can I test the port on the...

I have an a b 503 plc that has different recipies to do very much the same tasks but at different speeds. The problem is that when you change from one recipe to another the timing of a divice will change. Need all the help I can get on this....PLEASE!

Does anyone have an old bios disk or have any idea how to get into setup on an old dos 3.3 laptop?

What does the J-4 jumper on an allen bradley 503 cpu card do? It has 2 posistions 1 for peogram and 1 for protect.

I have an Allen Bradley 503 plc and it has an input from 1 inverter controlled motor (mechanically driven encoder) and another inverter controlled motor that has a mechanically operated switch for an input to the plc. It should compare the two inputs and sync. the two inverters together with the...