Difference between revisions of "Voltcraft VC-840"
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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. | 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 [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-da-01-en-RS232_Protocol_VOLTCRAFT_VC840_DMM.pdf short protocol description is available from Voltcraft/Conrad]. | A [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-da-01-en-RS232_Protocol_VOLTCRAFT_VC840_DMM.pdf short protocol description is available from Voltcraft/Conrad]. And [http://www2.produktinfo.conrad.com/datenblaetter/100000-124999/121112-da-01-en-Digitalmultimeter_VC840_Schnittstellenp.pdf another one]. | ||
TODO: Optional USB cable. | TODO: Optional USB cable. | ||
Revision as of 00:51, 8 July 2012
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)
- ...
- TODO
- TODO
Photos
Multimeter:
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
TODO.