Need a serial to usb for megger PAT 4

[ohreally]

Can anyone suggest a proven serial to usb cable for the above Megger. The output socket on the instrument is male.

 

[patdev]

From experience, Serial to USB converters with an FTDI chipset will work fine with the Megger PAT4.

Remember that in addition to the Serial to USB converter you need to use the Megger Download cable connected inline as the wiring between pins in the download cable is essential. It also ensures you have a female to plug into the Male RS232 on the PAT4.

 

[ohreally]

Someone has helped themself to the megger serial cable - will a generic lead allow connection to a usb convertor or does it have to be a megger lead?

 

[patdev]

I think you will struggle with a generic lead. This is the wiring diagram I have for the Megger PAT4 Serial Cable.
[FONT=Verdana, Arial, Helvetica, sans-serif]
Megger PAT4 DVe[/FONT]

[TABLE="width: 39%"]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]Signal[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]PAT4[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]PC[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]DCD[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]1[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]7[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]RXD[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]2[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]3[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]TXD[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]3[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]2[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]DTR[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]4[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]6 and 8[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]GND[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]5[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]5[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]DSR[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]6[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]4[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]RTS[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]7[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]1[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]CTS[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]8[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]4[/FONT][/TD]
[/TR]
[TR]
[TD="width: 14%"]
[/TD]
[TD="width: 25%"][FONT=Verdana, Arial, Helvetica, sans-serif]+5V[/FONT][/TD]
[TD="width: 30%"][FONT=Verdana, Arial, Helvetica, sans-serif]9[/FONT][/TD]
[TD="width: 31%"][FONT=Verdana, Arial, Helvetica, sans-serif]9[/FONT][/TD]
[/TR]
[/TABLE]

I beleive the critical pins are 2 and 3 twisted with 4 to 6 and 8 tied.