gnupic: Re: [gnupic] more on first picprog attempt
Subject:
Re: [gnupic] more on first picprog attempt
From:
Jan Wagemakers ####@####.####
Date:
19 Jun 2006 07:32:42 +0100
Message-Id: <20060619063232.GA16273@qwerty.be>
Maxim Wexler ####@####.#### schreef:
>> Has your PC serial port got enough voltage to drive it? Some laptop
>> serial ports can't do better than +/- 5V.
> I checked VDD using the gnd on the schematic(had been using the metal on
> the cable) and found 5.2V. So, does this mean I have to find a way of
> getting more power to it or get into a low voltage mode...?
To meassure if your serial port is a "low voltage" serial port, don't
connect anything to your serial port. Meassure between GND and various other
pins and read the voltage.
On my normal PC I meassure -11.65V and picprog is working on that serial
port.
On my laptop I meassure -5.66V and picprog isn't working because that
voltage is to low.
> I've used an external modem on it no problem.
For an external modem, the voltage of the serial port is not that important.
For a JDM-style programmer the voltage is important because it uses this
voltage to create the ±13V for high-voltage programming.
--
Met vriendelijke groetjes - Jan Wagemakers -
... I don't have to be careful, I've got a gun --Homer Simpson
