Celestron Compustar Bedienerhandbuch Seite 28

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When the input stops, the electromagnetic field will decay, the spring will flip the relay switch
back to its “nc” position and restore electrical balance on DB-9 pin 1 and movement in the X
axis will not be in favor of either the +X or X direction. Thus, extra movement in the +X
direction will cease. Similarly, current coming from the autoguiding computer via the yellow
RJ-11 wire number 5 (referred to as “operating +Y” in the diagram) will induce an
electromagnetic field in coil K3 adjacent to relay number K3. This will flip relay switch
number 3 from its “nc” to its “no” position, putting pin 3 on the DB-9 connector at ground on
DB-9 pin 5, 7 or 9 through the Y relay. This will upset the electrical balance on DB-9 pin 3 in
favor of the +Y direction and will move the Y axis drive in the +Y direction. When the input
stops, the electromagnetic field in coil K3 will decay and relay number 3 will flip back to its
“nc” position, restoring the electrical balance on DB-9 pin 3 and movement of the Y axis drive
will stop. The effects of operating the X and Y inputs are listed on the diagram for those that
wish to pursue this further, but the effects are to put the corresponding DB-9 pins at +5V DC
from DB-9 pin number 8 through relays as indicated on the diagram. These actions have the
opposite effect by upsetting the electrical balance on DB-9 pins 1 or 3 in the opposite
direction, thus moving the corresponding drives in the opposite directions.
When you actually operate your autoguider, you will be able to hear the relay switches inside
the relay box clicking open and closed in response to electrical signal commands from the
autoguiding computer.
Connecting The Autoguider Relay Box.
Once the autoguider relay box is properly assembled with its RJ-11 cable input and its DB-9
cable output (Figure 16), it can be connected between the autoguiding computer and the
Compustar computer module. With both the autoguiding computer and the Compustar booted
up, the RJ-11 jack is plugged into the female modular jack plug on the autoguiding computer
(Figure 6). The DB-9 male plug is connected to the center port on the Compustar computer
module (Figure 16).
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