| Electronics > Repair |
| Agilent 34401A Serial port pints 3 (TX) 5(GND) stuck at 9V on sys (SOLVED) |
| (1/4) > >> |
| The_Spectrum.A_idiot:
Dear All , After finally fixing my instrument I have a new issue. THe serial port regardless of its selected on the I/O between RS232 or GPIB the device directly applies 9V on the TX pin. Is this normal ? or I am looking at another issue ? Thanks Addendum : Using wrong method to talk to the instrument |
| macboy:
RS232 idles at the high voltage level, so this is normal. |
| squadchannel:
RS-232 protocol, it would be normal operation. There is no problem. RS-232 detects "0" at positive 3-25V and "1" at nagative 3-25V, not TTL. |
| The_Spectrum.A_idiot:
okay , but when I connect a USB to serial device seems to not be happy with said levels. Do I need so have something else in-between the instrument and the USB to serial device ? Is the first time I am encountering such issue. |
| jchw4:
--- Quote from: The_Spectrum.A_idiot on October 03, 2024, 11:29:48 am ---okay , but when I connect a USB to serial device seems to not be happy with said levels. Do I need so have something else in-between the instrument and the USB to serial device ? Is the first time I am encountering such issue. --- End quote --- https://www.keysight.com/us/en/lib/resources/training-materials/communicating-with-instruments-using-rs232.html TLDR: you need correct cable. |
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