Last updated: 29 March 2002

ETX90 Focuser pinouts

Sent:	Tuesday, March 26, 2002 20:29:23
From: (Richard Seymour)
The ETX90's focuser is a modified I2C-bus controlled, addressable
intelligent device.

The pinout is (looking at the AUX hole)

| 4 3 2 1 |
+--+   +--+

1 -- ground
2 -- aux data
3 -- aux clock
4 -- +12v

Do a web-search on "I2C bus" and read Meade's patent 6304376 for details
on the protocol used in addressing the peripherals. The focuser also has
to respond to interrogation by the Autostar (it asks "are you there"?)

So it's not easy....  it's NOT a simple "voltage to motor" situation
like the #1206 (i think that's the model) that works with the LX90 and
LX200 family.

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