Preset Motor Positions

[True South]

Several of the motor manuals that I have reviewed, indicate that postions 1-26 are pre-programmed with a set of satellites.

Can these positions (1-26) be reprogrammed to different satellites and how is the reprogramming accomplished?

Thanks

[DruzeTito]

ive heard this question before but I dont think anyone knows what those presets are used for.

[pmb1010]

I thnk they are preset for satellites that are viewable in europe, and can't be changed.

[True South]

The Eutalsat Diseqc specification provides for setting and recalling angular position settings by number. The following is an excerpt from the specification.


Satellite Positions are defined by positive binary number parameters from 1 (‘01’) upwards. Thus the command byte / parameter ‘6A 01’ Stores the
present motor position as “Position 1” and command byte / parameter
‘6B 01’ causes the motor to drive back to this stored position at any later
time. The parameter ‘00’ is reserved as a “reference position”, and all Masters
should be capable of transmitting this parameter with the above commands,
when required. The “Store Position 00” command can be used just to “Enable
Limits” and the “Goto Position 00” command can cause the motor to drive to
a “Reference Position” which will normally correspond to due South, but may
be the easterly “Hard Limit” (i.e. defined by physical switching within the
motor unit) if so implemented in the Positioner Motor Unit.

All of this would lead me to think that the motors come preprogrammed with 26 settings, but they can be changed if desired by the correct Diseqc commands from the receiver.

Several phone calls to the tech support groups of the larger suppliers were unproductive.

I don't have a motor or receiver to test with.

[pmb1010]

I think what you are showing is true, but I think the motor manufacturers prefill, and write then write protect the 1st 25 or so sat positions.
This keeps the untrained from wiping out the fixed positon sats they program in place.

IIRC, the slots 26-40 or so is available for users to configure and write their own sat data into.

So the specs show that they can be written to, but if the motor manufacturers lock the 1 to 26 or so slots the "write byte" command will be ignored.

At least that's my guess anyway.

[True South]

Sounds like a reasonable explanation. On another forum, someone said that his receiver didn't allow storing position info in 1-26.

I don't have a motor or receiver to try it on. There ought to be a way to unlock the pre-programmed area. Why should the Europeans be so privileged?

[DruzeTito]

because they are Europeans.. :wink: