DiSEqC – Digital Satellite Equipment Control – has been introduced by the European satellite provider Eutelsat as an open standard. It enables receivers to control peripheral hardware such as LNBs, multi-dish switches and antenna rotors. In most cases DiSEqC is used for switching between satellite positions. There are different DiSEqC levels. TransEdit supports DiSEqC up to level 1.2 (which means, up to 64 satellite sources and motorized dishes), provided the DVB-S card and driver allow to send such DiSEqC commands.

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General Remarks | DiSEqC Selection | DiSEqC Editor | Positioner Console

General Remarks

Sometimes DiSEqC does not work as expected. There are several reasons for it:

Microsoft has missed to define a clear unified method for sending DiSEqC commands via the BDA interfaces (Broadcast Driver Architecture). Therefore every vendor of DVB-S devices uses a different method, or with other words, DiSEqC has to be implemented vendor-specific in an application. Some vendors only provide very poor documentation about their „private“ DiSEqC interface, some not at all. Often enough user feedback, trial and error are the only means to solve resulting problems. DVBViewer and TransEdit can only support DiSEqC for a specific DVB-S device if the interface is sufficiently known.

The interface of some vendors is limited to the basic DiSEqC 1.0 Pos/Opt commands. In this case DVBViewer and TransEdit cannot support cascaded switches (DiSEqC 1.1) or a positioner (DiSEqC 1.2).

There are devices (particularly TechniSat SkyStar2) that provide a DiSEqC 1.1/1.2 interface, but the driver blocks according commands in order to avoid damage caused by the high power consumption of motorized dishes.

DVB-S cards must generate the voltage for supplying switches, LNBs and positioners from the voltages that are available in a PC, thus being not so powerful as receivers with a dedicated power supply. Additionally it is more difficult in a PC to achieve an accurate DiSEqC timing. That is why sometimes a receiver is able to perform switching without problems, but not a DVB-S card connected to the same antenna cable – it may depend on the type of DVB-S device, its driver and the tolerance of the switch.

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The situation is complicated even more by companies selling relabeled hardware of other companies, sometimes with modified drivers. If you are not sure which DiSEqC Level is supported by your DVB-S device or which device is suitable for your needs, search the DVBViewer Forum or ask other users for their experience. In some cases even the DVBViewer developers do not know whether it works or not, because it is impossible to test all available devices under all circumstances.

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DiSEqC Selection in the Main Window

The left side of the TransEdit Main Window provides a dropdown list for assigning a DiSEqC setting to the selected transponder list resp. satellite position:

None: If DiSEqC is set to None, TransEdit and DVBViewer send no DiSEqC commands at all - the appropriate setting if you are only receiving a single satellite position, and no switch is involved that requires DiSEqC commands, e. g. if your DVB-S card is directly connected to a Single or Dual (Twin) LNB. Other DiSEqC settings will have no effect in this case, except slowing down channel switching and scanning slightly.

Simple A/B: These settings are suitable for simple two-way switches without DiSEqC microcontroller that are only able to respond to analogue tone burst signals („Mini DiSEqC“ for switching between two satellite positions). However, these switches are outdated, rarely used nowadays and supported insufficiently by DVB-S card manufacturers, so chances are that it will not work. Only use Simple A/B if you are sure that your DVB-S card is connected to such a tone burst switch.

PosA/OptA...PosB/OptB: These settings (also called Input 1...4) refer to the common DiSEqC 1.0 commands for switching between up to four different satellite positions. Try them first, one after the other, if you are not sure which setting is required. Click Apply after having selected one of them, and try to scan.

Preset Position (also called „Go to Satellite Position nn“) can be used for motorized dishes. The according DiSEqC command lets the motor drive to a certain position, either pre-stored in the positioner unit ROM or user-defined with the Store Preset command in the TransEdit Positioner Console. A number in the range of 0...255 is assigned to each position, where 0 is reserved as reference position (normally corresponding to due south). Selecting Preset Position lets an input field appear allowing you to enter the number of the desired position.

Angular Position (also known as USALS, Universal Satellite Automatic Location System) is a more convenient way to drive the motor to a satellite position, provided the positioner unit supports it. „Angular Position“ avoids having to search and store every single position manually. Recommendable are the motors from STAB Italy, the developer of this system. This setting lets TransEdit calculate the motor angle from the satellite orbital position and the latitude/longitude of your site and send the result as DiSEqC command to the positioner. „Angular Position“requires a correct satellite orbital position (editable in the Main Window) and entering once the latitude and longitude of your site in the Positioner Console.

Extended: Selecting this option opens the DiSEqC Editor Window (see below) and – for accessing it later - lets an Edit Button appear in the Main Window. „Extended“ is the expert mode enabling user-defined DiSEqC command sequences.

Hints for DVBViewer Pro: Go to the Channel Editor. Select a root folder representing a satellite position. Select the required DiSEqC setting in the DiSEqC Drop-down List. In case of „Preset Position“ an input field appears. Enter the number referencing the desired satellite position (see above). In case of „Angular Position“ make sure that the orbital position is entered correctly, as shown in the TransEdit Main Window. Additionally DVBViewer needs to know the latitude and longitude of your site for calculating the „Angular Position“ command. It will prompt you to enter them, if not yet done. More hints concerning the „Extended“ setting are given at the end of the DiSEqC Editor section (see below).

Finally click „Apply“ in order to update all contained channels to the new settings. Please note: Though DVBViewer Pro allows to set DiSEqC per channel, it is strongly recommended not to mix up different DiSEqC settings within a root folder, in order to keep the channellist clearly arranged and the handling easy.

Hints for DVBViewer GE: Select a root folder in the channel list. Open the DVB Network Properties by clicking the Properties Tool Button at the bottom. Select the required DiSEqC Setting in the DiSEqC Dropdown List. In case of „Preset Position“ an input field appears. Enter the number referencing the desired satellite position (see above). In case of „Angular Position“ or „Extended“ make sure that the orbital position is entered correctly, as shown in the TransEdit Main Window. Additionally DVBViewer needs to know the latitude and longitude of your site for calculating „Angular Position“ commands.„Extended“ requires having entered a DiSEqC command sequence for this satellite position in TransEdit before (see below).Finally click Apply.

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The DiSEqC Editor

The DiSEq