Orion Sirius EQ-G Instruction Manual page 19

Play Back the PEc record
PEC tracking can be activated under the Setup menu or by
pressing the Setup quick reference button when needed. In
the Setup menu, choose "Set Tracking", then "PEC + Sidereal".
The Sirius EQ-G will play back the corrections you made dur-
ing the PEC training cycle and start tracking with periodic error
compensated for.
Note: The Sirius EQ-G will continue to track in the PEC + side-
real mode until another tracking mode is selected. If the power
is turned off while the Sirius EQ-G is in the PEC + sidereal
mode, the hand controller loses synchronization with the R.A.
worm gear and the PEC training will have to be repeated when
the power is turned back on. To avoid this, be sure to return the
telescope to its home position by selecting "Park Scope" under
"Utility Functions" before turning off the power.
appendix c: rs‑232
connection
The Sirius EQ-G hand controller must be set to RS-232 mode
in order to establish an interface connection with a PC. Under
the Utilities menu, select "RS232" and press ENTER to initiate
the computer interface mode. The Sirius EQ-G will now com-
municate with the PC at a rate of 9600 bits/sec, no parity and
stop bit. All angles are communicated with 16 bit numbers.
initialization
1. PC sends one byte ( 63 = ASCII "?") to check wheteher the
Sirius EQ-G is ready.
2. The Sirius EQ-G responds with one byte (35 = ASCII "#")
when the Sirius EQ-G is ready to respond.
Note: All INITIALIZATION steps are recommended but not
necessary
Goto r.a.‑DEc positions
1. NITIALIZATION
2. PC sends (82 = ASCII "R")
3. PC sends the R.A. high byte, R.A. low byte, DEC high byte,
DEC low byte.
4. When the scope is finished slewing, it will display a "@" on
the hand controller.
Goto alt‑az positions
1. INITIALIZATION
2. PC sends (65 = ASCII "A")
3. PC sends the Azm high byte, Azm low byte, Alt high byte,
Alt low byte.
4. When the scope is finished slewing, it will display a "@" on
the hand controller.
Get R.A.-DEC positions
1. INITIALIZATION
2. PC sends (69 = ASCII "E")
3. The Sirius EQ-G sends the R.A. high byte, R.A. low byte,
DEC high byte, DEC low byte.
Get Alt-Az positions
1. INITIALIZATION
2. PC sends (90 = ASCII "Z")
3. The Sirius EQ-G sends the Azm high byte, Azm low byte,
Alt high byte, Alt low byte.
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