Difference between revisions of "Voltcraft VC-840"

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</gallery>
</gallery>


'''RS232 cable''':
'''RS232 cable:'''


<gallery>
See [[Multimeter cables#UNI-T_UT-D01]].
File:Voltcraft dmm rs232 cable.jpg|<small>Cable</small>
File:Voltcraft dmm rs232 cable ir.jpg|<small>Cable, IR</small>
File:Voltcraft dmm rs232 cable open.jpg|<small>Cable, open</small>
File:Voltcraft dmm rs232 cable pcb front.jpg|<small>PCB, front</small>
File:Voltcraft dmm rs232 cable pcb back.jpg|<small>PCB, back</small>
</gallery>


'''USB cable''':
'''USB cable:'''


TODO.
See [[Multimeter cables#UNI-T_UT-D04]].


== Protocol ==
== Protocol ==

Revision as of 23:53, 16 July 2012

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:

See Multimeter cables#UNI-T_UT-D01.

USB cable:

See Multimeter cables#UNI-T_UT-D04.

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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