Please suggest the pin-out configuration from USB type-A cable to a 6 pin plug on PCB of crouzet millenium 3?

Question

I have crouzet millenium 3 logic controller, that needs to be connected to the USB or serial port of the PC. The simple cable costs more than 60 euros. Can an electronic expert suggest me a possible pin-out configuration of the 6 pin plug on the PCB of the controller. The 6 pin plug can take either a USB or a Serial (9 pin) port connection from PC. The controller has a ATME GA128 CHIP.
I can see pin-1 going to ground and pin-2 going under a TTE 8pin IC, pin-3 passing through a resistror (number on it 682) to the TTE IC, pin-4 going under the main chip,pin-5 passing through resistors to the main chip, pin 6 passing through a capacitor (I think) to the ground.

any ideas? if dont know about this controller then, please suggest me a possible pin-out configuration.

Thanks

Answer 1

I'd forget USB, the USB cable for it has quite a sizable lump in the end which is probably a USB to serial converter.



Many PLCs use RS485 for the programming port, so you may need a converter of some sort either way.



I'd start by making a 'break-out' cable from the PLC connector to eg. a bit of 'chocolate bloc' screw terminal strip.





Does any pin have a 5V or 3.3V supply on it to ground? That could be to supply active electronics in a cable.

See if the voltage changes if you add a 1K resistor to ground. That will not do any harm, but will cause the voltage to drop a bit on any pins driven from ICs rather than direct power.

if it drops to near 0V, it's an input pin with a pullup resistor.



You can also try linking the 5V (or 3.3v?) pin to each other pin via 1K and again see if the pin voltage changes slightly (= output) or a lot (= input).





If it has the capability for direct connection to a com port, the data input would go through a resistor or two (divider & possibly clamp diodes) to limit the RS232 +/- 12V levels down the 5V or 3.3V internal logic.



Once you are sure which are inputs & outputs, try connecting basic RS232 with just ground and RXD/TXD. Connect TX from the pc to an input that has protection resistors (Pin 3 sounds promising), and the RX back to the PC to each other pin in turn.



You presumably have the comms software for it.

Answer 2

Yes

Answer 3

plz.i have ur problem.could u find any way to solve it.