Voltcraft VC-840

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:

• Multimeter IC: Fortune Semiconductor FS9721_LP3 (datasheet)
• ...

RS232 cable:

• TODO

USB cable:

• TODO

Photos

Multimeter: TODO.

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.

TODO: Optional USB cable.

Resources

TODO.