Interface

The switching of electrical consumers (laboratory power supplies, power supplies, motors, heating coils, neon glow) can lead to the disconnection of the USB port on your computer, especially if these consumers and the computer are connected to a common power strip.
In case of problems, the computer should have an isolating transformer or supplied through a dedicated circuit.

The reliability of the USB port of the personal computer or notebook computer can be improved by simple measures:

• Use a high-quality USB cable with ferrite core
• Number of USB devices used reduce because the total current is limited to 500mA,
• Use of an active (self-powered) USB hubs,
• Using notebook power supplies with ground.

In particular, the use of an active USB hub with its own power supply can improve the reliability.

If the USB connection is after about 30 minutes to about 2 hours occasionally interrupted, then this may be due to the power settings for USB.

Start the Device Manager.

Disable the power settings for USB the checkbox "computer to turn off the device to save power"

For transmitters whose AD converter is powered by the USB port, there is often considerable interference from 50Hz interference.

The cause is often the switching power supply of the notebook.

Possible solutions are:

• Using a power supply with earthing,
• Grounding the USB ports,
• Earth of the negative pole of the power supply on notebook

The Messversärker GSV 1A8USB has this extra-a 2mm socket for connecting a ground wire.

We support the software development. The following options are available:

• Windows DLL "MEGSV" for GSV-2 and GSV-3
• Windows DLL "MEGSV4" for GSV-4
• Labview VIs and examples of GSV-2, GSV-3, GSV-4
• Example programs in C ++ and Visual Basic Express 2010 for GSV-2 and GSV-3
• direct communication without DLL via ASCII protocol

The protocol is documented in the manual of the measuring amplifier.

... More information on programming

GSV-2 are available with CANopen protocol.
... More information CANOpen

GSV-3 is available with "ME protocol
If required, we provide a program available that works with the PCAN-USB interface from PEAK-System. PCAN-USB with GSV-3

GSV-4 is available with "ME protocol
here currently only helps the user manual ...

The question constitutes already know the answer: you must communicate directly, if you do not work under Windows.

Especially easy it when setting at GSV-2 and GSV-3 ASCII protocol is
a maximum of 100 readings are transmitted per second, instead of up to 1000 readings per second with the binary protocol. The only disadvantage with ASCII protocol

The binary protocol of the GSV-4 can be relatively easy to process compared to the binary protocol of the GSV-2 and GSV-3, as the measured values ​​are embedded in a fixed frame between pre- and postfix.

When high data rates are required and GSV-2 or GSV-3 come with binary protocol used, then it should be used as far as possible, the Windows DLL. Reason: To synchronize only 1 character is used as a prefix.

If the measuring data - particularly at high data rates - do not arrive evenly or if there is a problem with the connection setup with the amplifier, this can be due to incorrect driver settings for the GSV-2TSD, GSV-3USB, GSV-4USB, GSV-6DEV USB SerialPort Driver: In this case, try the following:

1. Open the Device Manager (eg via Control Panel -> System)

2.Fold in the entry "COM and LPT".

3.Click on the lower entry "USB Serial Port (COMxx)" with the right mouse button, where "xx" for COM no. Which has been assigned by Windows. Then select "Properties"

4. Click on "Advanced" in the "Connection settings" tab in the window that opens. This dialog opens:

Set the "Wait time (ms):" to 1 as shown in the figure. By default, it is usually set to 16 ms, which is unfavorable.

If the measuring data - particularly at high data rates of the GSV-2TSD, GSV-3USB, GSV-4USB or GSV-6DEV do not arrive evenly or if there is a problem with the connection setup to the amplifier, this can be due to incorrect driver settings. In this case, try the following:

1. Open the Device Manager (e.g. via Control Panel -> System)

2. Unfold in the "Ports (COM & LPT)" entry.

3. Right-click on the sub-entry "USB Serial Port (COMxx)", where "xx" stands for the COM no., which has been assigned by Windows. Then select "Properties"

4. In the "Port Settings" tab, click "Advanced" in the window that opened. This dialog appears:

Set the "Latency Timer (msec):" to 1 as shown in the figure. By default, it is usually set to 16 msec, which is unfavorable.