Voltcraft VC-840
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The Voltcraft VC-840 is a CAT IV (600V) handheld digital multimeter with RS232 or (optional) USB connectivity.
See Voltcraft VC-840/Info for more details about the device.
Hardware
- Multimeter IC: Fortune Semiconductor FS9721_LP3 (datasheet)
- ...
Photos
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.