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Cyrustek ES51978 based multimeter, serial communication
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This is a set of example captures of the serial (UART) communication and
its timings on an optical RS232 cable for the ISO-TECH IDM103N digital
multimeter based on the Cyrustek ES51978 chip.

The UART parameters are 2400 baud, with 7e1 settings.

Details:
http://www.cyrustek.com.tw/spec/ES51978.pdf


Logic analyzer setup
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The logic analyzer used was an OpenBench Logic Sniffer (at 100kHz):

  Probe       RS232 cable
  -----------------------
  0           RX


Data
----

Contains 3 samples sent by the multimeter set in resistance mode, measuring
skin resistance, a few Mega Ohm.

The sigrok command line used was:

  sigrok-cli -d ols:conn=/dev/ttyACM0 -c samplerate=100khz:rle=1 \
             -p 0=RX -t RX=0 -o es51978.sr --samples=245760