Equinox Systems GEMINI Uživatelský manuál stáhnout pdf (Strana 95)

Gemini Users Manual 90

• If this happens immediately after start-up, limits may be incorrectly set. Cold start

the mount, and check the limits. Slew to the places where the limits should be and

select “Setup→Mount Parameters→Set Safety Limit” for both the east and the

west limits.

7.1.12 Autoguider Calibration Problems

• Be certain that you are in Photo Mode or All Speed Mode. The autoguider port

will only work in these two modes. Make sure you have not left Gemini in Menu

Mode, and that you are using a tracking rate that is appropriate for your

observation.

• Make sure you have the correct cable to connect the autoguider to the Gemini. Be

sure to use an Optocoupler unit or Relay Box (with appropriate cable) if you have

an autoguider without relays and an older Gemini (motor cables use RJ-45

connector). If your Gemini unit uses DIN connectors for the motors, you can

connect TTL output autoguiders directly to Gemini. Refer to Appendix 8.6 for

more details.

• If RA calibration works but Dec. does not, check the backlash in the Dec. gear.

Set the TVC or increase the autoguider’s hysteresis setting.

7.1.13 Gemini Displays “Autoguider Error”

• This message indicates that Gemini received contradictory signals (RA+ and RA-

or DEC+ and DEC-) at the same time. If this happens occasionally, it can be

ignored. Otherwise check the cable from the autoguider to the Gemini and keep it

as short as possible. Do not use a twisted cable; it could induce spurious signals

from one wire to the other.

7.1.14 Serial Communications Problems

• Ensure that you are using the correct cable between Gemini and the PC or GPS

receiver. Refer to Appendix 8.5 for details.

• Start Gemini in Debug Mode and look at the information buffer to see if data is

actually being received from the PC. Refer to section 7.2 below.

• If you are using a PC with a fast CPU and buffered serial I/O circuitry, the

microcontroller of the Gemini system may not be fast enough to receive and store

all characters sent to it. Check the setting of the communication port of your PC

and disable the 16550A serial controller’s FIFO. You can try to use a smaller

FIFO send buffer first.

• See also section 6.1.3.

7.1.15 "CMOS reset" Message upon Startup or Incorrect Date/Time

• The internal Li battery was exchanged or is low. Power off the Gemini and open

the Gemini electronics unit. Replace the internal battery with a fresh one. Older

Gemini units use a CR2032 Li battery, while newer units use a CR2354 Li

battery. Be sure to replace the battery with the same type that came with your

Gemini. After you power up the Gemini again, you will see this message. Use

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Equinox Systems GEMINI Uživatelský manuál Strana 95