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Astrometric's
(discontinued) SkyWalker2 Telescope Motor and Accessory Controller:
archive specifications Note: SkyWalker2 contains, and will continue to contain (with SkyGuide and firmware upgrades), the same functionality as SkyWalker1 and SkyWalker-Servo into the foreseeable future. We are committed to both supporting and providing new functionality for all of our discontinued products. Specifications: |
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| Size
(excluding connectors): |
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| • | 7.83" x 3.29" x 1.15" | ||
| • | 198.9mm
x 83.5mm x 29.2mm |
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| Control
switches: |
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| • | Power | ||
| • | Standalone/System
Mode select |
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| Indicators:
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| • | Power | ||
| • | Programmable Mechanical Error Correction (PMEC) | ||
| • | Battery status | ||
| • | Operational
status (Standalone/System Mode) |
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Internal Timebase Accuracy: |
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| • | +/-30ppm
from -20C to 50C ambient |
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| Power
Supply Requirements (5.5mm x 2.5mm connector): |
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| • | 11.0VDC to 14.2VDC* (separate model with 14.2VDC to 28.0VDC range is available) | |
| - | 330mA when tracking and no accessories attached to HighDrive or TCS Ports. | |
| - | 5.0Amps
with HighDrive & TCS ports all at maximum load and both motors
slewing at full speed. |
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| Environmental
Requirements: |
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| • | -20C to 50C ambient | |
| • | 5%
- 95% relative humidity, noncondensing |
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| Motor
Port (Circular Metal-shell 14-pin): |
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| • | Motors | |
| - | Drives two bipolar, low inductance stepper motors. | |
| - | 2.0Amps/phase maximum. | |
| - | 32 microsteps/full-step. | |
| - | 160,000
microsteps/second maximum. |
|
| • | Limit switches | |
| - | Normally
closed contacts which open to disable motors when mount/scope move
beyond safe limits. |
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| • | Index inputs for Periodic Error Correction for each axis | |
| - | Optional normally open contacts (included with RetroKit™ packages) to indicate one complete rotation of worm gear. | |
| - | Required for Periodic Error Correction programing to be available at power-up of SkyWalker2 without retraining. | |
| - | Required
for automatic motor stall detection. |
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| HighDrive
Port (8 pin MiniDIN): |
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| • | 2 BiDrive outputs each capable of sourcing or sinking 250 mA from each other in a push-pull configuration. | |
| - | Powered by 12VDC
input power supply voltage or internal 3VDC/9VDC** regulator (ideal
for NGF motorized focusers). |
|
| • | 4 UniDrive outputs each capable of sinking 500mA. The 4 UniDrive outputs are limited to a total draw of 1.0Amp. | |
| - | Powered by 12VDC
input power supply voltage or internal 3VDC/9VDC** regulator. |
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| Telescope
Control System (TCS) Port (6 pin MiniDIN): |
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| • | Expansion
port for future Astrometric Instruments' accessories. |
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| Autoguider
inputs (MJ-12): |
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| • | Connects to an autoguider such as the SBIG ST-4. | |
| • | The
autoguider corrects at the currently selected SkyWalker2 pan/correction
rate. |
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| Optical Encoder
inputs (MJ-45, used in System Mode): |
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| • | Connects optional optical encoders for closed loop operation. | |
| - | Supports Tangent Instruments™ pinout. | |
| - | Supports Astrometric
Instrument's enhanced encoder pinout (i.e. provides axial index input
for "zero" star alignment). |
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| • | Detects
up to 20,000 encoder quadrature transitions per second. |
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| Handpaddle
port (MJ-11): |
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| • | Provides
connection to SkyWalker2's handpaddle. |
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| PC Comm port
(MJ-11, used in System Mode): |
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| • | Three wire RS-232 interface (Txd, Rxd and GND) | |
| • | 9600 Baud, 1 Stop bit, No Parity | |
| • | 50
ft. (15m) maximum |
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| Handpaddle:
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| • | 14 ft (3m) coiled cord | |
| • | Powered from SkyWalker2 | |
| • | 3.60"
x 5.75" x 1.20" (91.5mm x 146.1mm x 30.5mm) excluding cord |
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| * When
BiDrive outputs are powered at 12VDC, the input voltage specification
changes to 12VDC +/-10%. |
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| **
Total current from the internal regulator is dependent on SkyWalker2's
supply voltage and output voltage selected: |
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|
Supply voltage
|
3VDC output
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9VDC output
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12VDC
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250mA
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500mA
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24VDC
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100mA
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125mA
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