Difference between revisions of "Voltcraft VC-870"

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The interface parameters for the [[Device cables#UNI-T_UT-D02|UNI-T UT-D02]] serial cable are '''9600/8n1'''.
The interface parameters for the [[Device cables#UNI-T_UT-D02|UNI-T UT-D02]] serial cable are '''9600/8n1'''.


A packet consists of 23 bytes.
A packet consists of 23 bytes:
 
{| border="0" style="font-size: smaller" class="alternategrey sigroktable"
|-
!Byte(s)
!Name
!Description
 
|-
| 0-1
| '''Function, function select'''
|
 
|-
| 2
| '''Range'''
|
 
|-
| 3-7
| '''5 main display digits'''
|
 
|-
| 8-12
| '''5 auxiliary display digits'''
|
 
|-
| 13
| '''?'''
|
 
|-
| 14
| '''?'''
|
 
|-
| 15
| '''Status'''
|
 
|-
| 16
| '''Option 1'''
|
 
|-
| 17
| '''Option 2'''
|
 
|-
| 18
| '''Option 3'''
|
 
|-
| 19
| '''Option 4'''
|
 
|-
| 20
| '''Dual display'''
|
 
|-
| 21
| '''Line feed'''
| Always 10 / 0x0a.
 
|-
| 22
| '''Carriage return'''
| Always 13 / 0x0d.
 
|}


Notes:
Notes:

Revision as of 23:45, 29 December 2014

Voltcraft VC-870
File:Voltcraft vc870.png
Status planned
Source code serial-dmm
Counts 40000
IEC 61010-1 CAT III (1000V) / CAT IV (600V)
Connectivity RS232 / USB
Measurements voltage, resistance, diode, continuity, capacitance, frequency, current, temperature, loop current, power + apparent power, power factor + frequency, effective voltage + current
Features autorange, hold, relative, backlight, min, max, minmax, true-rms, bargraph
Website conrad.de

The Voltcraft VC-870 is a 40000 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

Hardware

Multimeter:

We don't have teardown photos yet, but this article (see also this photo) claims that the DMM contains the following components:

RS232 cable:

USB cable:

Photos

Multimeter:

RS232 cable:

See Device cables#UNI-T_UT-D02.

USB cable:

See Device cables#UNI-T_UT-D04.

Protocol

Some (partially incorrect and also incomplete) protocol docs are available from the vendor.

The interface parameters for the UNI-T UT-D02 serial cable are 9600/8n1.

A packet consists of 23 bytes:

Byte(s) Name Description
0-1 Function, function select
2 Range
3-7 5 main display digits
8-12 5 auxiliary display digits
13 ?
14 ?
15 Status
16 Option 1
17 Option 2
18 Option 3
19 Option 4
20 Dual display
21 Line feed Always 10 / 0x0a.
22 Carriage return Always 13 / 0x0d.

Notes:

  • The bargraph value (only shown on the LCD for voltage, current, and resistance mode) is not contained in the protocol.
  • The auto-poweroff feature which powers the device off after 15 minutes is always disabled when the PC interface is "active" (i.e. the user pressed the REL/PC button for 1 second). Thus the respective "auto-poweroff" bit/flag, which is contained in the protocol, always has the same value.
  • The backlight status (on/off) is contained in the protocol.

Resources

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