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Remote Control of the AVS-47
The AVS-47x bridges can be connected to a remote computer in many different ways depending on types of the computer, operating system and application program. In all cases, connection can be made using a conventional shielded wire cable or using fibre optics. USB-Picobus with a wire cable comes standard with the resistance bridge, whereas the Serial and GPIB protocol converters are sold as separate options. They do not need any installation and they can be used also with already existing bridges. Both the USB-Picobus and the protocol converters are equipped with either a 5m or optionally a 10m shielded cable. Maximum safety against potential RF leakage inside the shielded cryostat room is achieved by selecting an optically connected version of the interface. The optical cable is available in two lengths, 5m (standard) and 10m (optional).
Please find below find more detailed descriptions about the available alternatives.
This is an illustrated PDF leaflet about the possible remote controlling ways. Start by viewing this!
USB-Picobus Standard Interface
Typically, a wire cable connects the AVS-47x to the computer's USB port via a USB-232 adapter. If the computer has a physical COM: port, no adapter is required. Special use of the port's handshake signals makes this interface suitable only for PC-type computers running Windows and at least the base version of LabView2012 or newer. USB-Picobus is supported by an extensive set of LabView VIs. In addition to basic commands, they offer also higher-level features like temperature readout and automatic scanning. The old, now abandoned TS-530A Temperature Controller is fully supported.
When used with the AVS-47B version, the shielded interface cable is galvanically isolated in order to cut possible ground currents.
AVS47-Picolink User Guide
AVS47-Picolink replaces the wire cable of USB-Picobus by an optical fibre link. This option consists of two boxes, one near to the bridge and the other outside the shielded space. They are connected by a 5 or 10 meter all-plastic optical fibre cable. Programmability is exactly similar to that of the standard "wire" USB-Picobus.
AVS47-Serial/USB-W User Guide
This option converts the proprietary, synchronous low-level Picobus protocol into asynchronous serial format that uses the RS232 hardware standard. It can be used by any computer, operating system and programming language that support simple RS232 communication. A USB-232 adapter is required unless the computer has a physical COM: port. High-level operations like scanning or temperature display can be written by the user with the help of easy control and readout commands. These commands are described in the user guide. A minimum set of remote control commands is available for the old TS-530A.
This option consist of one external box and it can be added to the system also later. The cable length can be increased from 5 to 10 meters (option).
Here is a simple example of how to read and write using LabView. In addition to the .vi source code there are also PNG figures that can be viewed without LabView.
AVS47-Serial/USB-F User Guide
In the -F version, the wire cable is replaced by an optical fibre link, which adds a second small box. The first box is near to the AVS-47B, whereas the converter box with its programmed Arduino CPU is located outside the shielded space. The optical cable can be 5 or 10 meters (option).
(Production has been discontinued, few units are still available) This GPIB interface provides a wide range of commands, including automatic scanning and buffering of measurement results. The external unit is mostly compatible with the IEEE-488.2 programming standard and it is highly independent of the computer platform. The wire cable can be either 5m or 10m (option).
A LabView Driver, saved for LV7.1, is freely available for the AVS47-IB. In addition to the resistance bridge, it provides full support for the old TS-530A.
AVS47IB-Picolink User Guide
The wire cable between AVS-47B and AVS47-IB is replaced by a 5 or 10-meter optical fibre link. This requires addition of two small boxes so, that the first one is near to the resistance bridge and the second is outside the shielded space together with the GPIB box.
The AVS47IB-Picolink is an independent product. No changes to the resistance bridge or the GPIB box are required, so that this option can be added also later. From programming point of view, it is transparent.
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