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UNI-T UT61E RS232 serial interface cable to USB

Instructions

Connect RTS to ground(Pin 5 and Pin 7), DTR to 5V or 3.3V and invert the output with 74hc14 and you have TTL output. This will work at 5V and 3.3V.

Schematic

Enclosure

Assembly

Windows Software

  • Install CH430 driver
  • reboot
  • install [UNI-T-61E-ver-41.zip]
  • Launch
  • Connect to the right COM* port in the UI

Original multimeter software only reads COM1..COM4 ports. In VMWare you might need to force-map it to COM2.

Mac / Python

cd <to project folder>
python3 -m venv venv
source venv/bin/activate
pip install ut61e

UT61E communication config: 19200, 7 bits, odd parity, 1 stop bit

Plug the multimeter and turn it on. Look up the serial port with ls /dev/cu.usbserial*

On Mac/Linux pipe the serial port to es51922 with

(stty speed 19200 cs7 parenb -cstopb >/dev/null && cat) </dev/cu.usbserial-1440 | es51922

Parameters

    cs8                  Use 8 character bits
    parenb               Use a parity bit
    -cstopb              Don't use 2 stopbits, but just the regular 1

Output looks like

23:39:55.027797 0 V
23:39:55.027918 0.0006 V
23:39:55.027982 0.0006 V
23:39:55.469333 0.0002 V
23:39:55.969201 0.0002 V
23:39:56.469036 0.0001 V
23:39:56.968968 0.0001 V
23:39:57.468980 0.0001 V
23:39:57.969000 0.0014 V
23:39:58.469146 0.0008 V
23:39:58.969176 0.0008 V
23:40:00.068802 55.05 mV
23:40:00.568895 115.32 mV
23:40:01.068662 157.1 mV
23:40:01.568860 179.99 mV
23:40:02.068693 192.64 mV
23:40:02.568551 204.68 mV
23:40:03.068395 225.4 mV
23:40:03.568472 -121.83 mV
23:40:04.068386 -89.45 mV

One-shot mode from CLI

See https://github.com/ikatkov/ut61e_python