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Wi-Fi Wireless Telescope Computer Interface

Wi-Fi Wireless Telescope Computer Interface. by Monroe Pattillo President, SFAAA. Goals. Eliminate cable between computer and scope Remove nighttime trip hazard of cable Reduce scope setup/teardown times Identify generic, standards based solution

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Wi-Fi Wireless Telescope Computer Interface

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  1. Wi-Fi Wireless Telescope Computer Interface by Monroe Pattillo President, SFAAA

  2. Goals Eliminate cable between computer and scope Remove nighttime trip hazard of cable Reduce scope setup/teardown times Identify generic, standards based solution Validate solution with existing equipment Document and disseminate solution to others

  3. Telescope Computer Interface Serial (not parallel) Asynchronous (not char. or bit synchronous) RS-232 (TIA/EIA-232E) 9600 bps, no parity, 1 stop bit No handshake (not hardware, not software) Classical three wire interface (TxD, RxD, Gnd)

  4. Standards Based Wireless Technology Choices Wi-Fi (chosen for this validation) + flexible range, addressing, Internet routing - larger, more expense, more power Bluetooth (previous solution validation) + small, inexpensive, low power - addessing, short range, no Internet routing

  5. Wi-Fi Product Selection Criteria Wi-Fi IEEE 802.11b (compatible w/802.11g) Supports TCP/IP tunneling and web server External power (doesn’t use interface power) Product open information and availability Product adaptable to telescope control

  6. Telescope RS-232 Serial Interface Virtual Cable Wi-Fi Application/Protocol Layers Wi-Fi 802.11b Serial Device Adapter PC or PDA Wi-Fi 802.11b 2.4GHz Wireless Ethernet Interface Ethernet Interface Wired Interface, Wireless Access Point, Wireless Router, or Internet IP Protocol IP Protocol TCP Client TCP Server Telescope Application RS-232 Port Virtual COM Port Driver

  7. Quatech ABSE-100D IEEE 802.11b, TCP/IP tunnel, web server config Removable ant, Indicators, Mounting sleeve Captive serial cable, Includes AC-DC adapter Product adaptable to telescope control

  8. Adapting the ABSE-100D to Meade 8” LX-200 Classic Adapt ABSE-100D DB-9M to LX-200’s RJ-14 Need simple, easy to reproduce solution Need to dress it neatly to the LX-200 Sol: RJ-11 to RJ-45 to DB-9 to ABSE-100D 1 ft telephone cord and RJ-45/DB-9 adapter Velcro ABSE-100D to side of LX-200

  9. Wiring for the unmodified telephone crossover cord Unmodified End Black, Red, Green, Yellow Unmodified End Yellow, Green, Red, Black Y G B R B R G Y Just an unmodified standard crossover phone cord Use a stranded wire cord, not silver satin (foil over plastic)

  10. Wi-Fi on PC You need Wi-Fi IEEE 802.11b (or g) on PC Built-in, USB, or PCMCIA/CardBus Discover ABSE-100D, configure via web Set it to known IP address and port number Install VCOM software (or its equivalent) Establish virtual COM port (TCP port tunnel) Try to set PC virtual COM port to COM1..4 DPAC VCOM vs Lantronix COM port redirector

  11. The Solution ABSE-100D Velcro mounted and wire tied to the side of Meade LX-200 Classic (clear of fork arm movement) The Wi-Fi antenna can be tilted outward and rotated as needed or an extension cable can be used to relocate or to upgrade the antenna

  12. Operation Mount and connect solution to telescope Connect power to ABSE-100D Establish Wi-Fi network Connect PC to IP network to Wi-Fi network Connect PC virtual COM port to ABSE-100D Launch telescope control application on PC Enable telescope interface to virtual COM port

  13. Contact Information Quatech ABSE-100D www.quatech.com Lantronix COM port redirector www.lantronix.com Monroe Pattillo President South Florida Amateur Astronomers Association, Inc. (SFAAA) www.sfaaa.com Fox Observatory, inside Markham Park Open to public Saturday evenings til midnight NW corner of I-75-N/I-595 and FL-869/I-75-S

  14. Other Projects Previous Project Created wireless solution based upon Bluetooth Slightly lower cost, smaller pkg size than Wi-Fi Next Projects Create a poor man’s StellarCam Windows PC based application and server Source agnostic (video, webcam, files) Format agnostic (BMP, JPEG, TIFF) Stack and adjust images as they arrive Result image accessed via web browser Create Wi-Fi based control and imaging solution Wired Ethernet Servers - RS-232 & Video Concentration - Wired Ethernet to Wi-Fi

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