Difference between revisions of "Voltcraft VC-840"
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== Photos == | == Photos == | ||
TODO. | TODO: DMM photos. | ||
<gallery> | |||
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> | |||
== Protocol == | == Protocol == | ||
Revision as of 01:50, 29 June 2012
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:
- Multimeter IC: Fortune Semiconductor FS9721_LP3 (datasheet)
- ...
- TODO
- TODO
Photos
TODO: DMM photos.
Cable
Cable, IR
Cable, open
PCB, front
PCB, back
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.