Voltcraft VC-840

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Voltcraft VC-840

The Voltcraft VC-840 is a 4000 counts, CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

See Voltcraft VC-840/Info for more details (such as lsusb -vvv output) about the device.

Hardware

Multimeter:

RS232 cable:

  • TODO

USB cable:

  • TODO

Photos

Multimeter:

  • Voltcraft vc840 device front.jpg
  • Voltcraft vc840 device back1.jpg
  • Voltcraft vc840 device back2.jpg
  • Voltcraft vc840 battery1.jpg
  • Voltcraft vc840 battery2.jpg
  • Voltcraft vc840 pcb back.jpg
  • Voltcraft vc840 pcb front.jpg
  • Voltcraft vc840 ad737j.jpg
  • Voltcraft vc840 fs9721 lp3.jpg

RS232 cable:

  • Cable

  • Cable, IR

  • Cable, open

  • PCB, front

  • PCB, back

USB cable:

TODO.

Protocol

The connection to the PC is done using a cable which converts the optical signal (IR) on the multimeter to RS232.

The serial connection uses 2400 baud (hardcoded, cannot be changed) with 8n1 settings. The multimeter transmits 14-byte data packets periodically, the host can not send any commands whatsoever, only read the transmitted data.

A short protocol description is available from Voltcraft/Conrad. And another one.

TODO: Optional USB cable.

Resources

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