Re: Philips PM3350 serial port
- From: "mkaras" <mkaras@xxxxxxxxxxxxxxxxxx>
- Date: 2 Oct 2006 13:42:20 -0700
Tim Auton wrote:
Does anybody happen to know what kind of serial cable is required to
connect the RS-232C (25-pin) serial port on a Philips PM3350
oscilloscope to a PC? Specifically, I'm wondering if the PM3350 uses the
additional lines present on 25-pin serial ports but not on 9-pin ones
and whether it's a DTE or DCE device.
It's a male RS-232C port on the 'scope, does that mean it's a DTE?
Tim
You could try the following tests to determine the nature of the scope
serial port. Use an oscilloscope probe and look at each pin in the
DB-25 connector. Output pins are going to show a +/- voltage in the
ranges over a couple of volts positive or negative. Inputs will
typically make a small jump in the scope trace. Don't expect more than
noise level signal for inputs but it gives you a clue of connected
circuitry. It should also be possible to use a 10-12K resistor pulled
off first to +V and then to -V to pull the "input pins" away from their
floating near ground state. No connect pins in the connecor typically
display a smooth flatline on the scope. Finally the GND pin can be
verified via the resistor not being able to pull that pin above or
below the zero volt level.
Before you start a test like this you can greatly simplify the test
process and increase the reliabilirty of the results if you can guess
as what the pins the connector are normally connected to. For example
for a DB25 it is quite normal to expect the TxD and RxD signals on the
pin 2 & 3 pair. One should show output and the other input. This could
also point toward your answer for the DCE/DTE question.
- mkaras
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