12
RJ-45 port on the bottom of the SynScan controller. Push the
connector into the port until it clicks into place.
The smaller modular port next to the RJ-45 port on the hand
controller enables serial communication between the Sirius
Pro mount and a computer running astronomy software such
as Starry Night Pro. For that you will need the RS-232 com-
puter interface cable that was included with the mount. If your
computer does not have an RS-232 port, you will also need a
USB-to-serial adapter. Check telescope.com for an available
adapter.
As mentioned in Section 5.1, however, the mount also has an
integrated USB port for direct connection of the mount head to
a computer. If you use this method you would not connect the
computer to the SynScan hand controller.
5.4 Power supply requirements
The Sirius Pro AZ/EQ-G should be powered by a 12V DC or
AC-to-DC power supply with a 3-amp or higher output current
rating.
• Output Voltage: DC 11V (minimum) to DC 16V
(maximum). Voltage not in this range could cause
permanent damage to the motor controller board or the
hand controller.
• Output Current: 3A for power supply with 11V output
voltage, 2A for power supply with 16V output voltage.
• Do not use an unregulated AC-to-DC adapter. When
choosing an AC adapter, it is recommended to use a
switching power supply with 15V output voltage and at
least 2A output current.
• If the power voltage is too low, the motor controller will
automatically stop the motors.
Part 6: otHEr sirius Pro
aZ/EQ-G FEaturEs
6.1 auxiliary Encoder Function
The Sirius Pro mount is equipped with auxiliary encoders on
both the R.A. axis and Dec. axis. These enable the mount to
continue tracking even when a user unlocks the clutches and
manually rotates the mount in R.A. and Dec. With this feature,
you can manually operate the mount any time without worry-
ing about losing the mount’s GoTo alignment status. When you
want to operate the mount with the SynScan hand controller
again, no re-alignment is required; all that is needed is to re-
lock the clutches. This feature can be enabled or disabled in
the SynScan hand controller.
6.2 Permanent Periodic Error correction
The Sirius Pro mount is equipped with an index on its R.A.
worm, thus the motor controller can keep tracking the current
position of the worm. After a proper PEC training routine, in
which the training data is stored in the motor controller per-
manently, a user can start the periodic error correction (PEC)
at any time to improve the tracking performance for astropho-
tography. A training process is not required in the next observ-
ing session (assuming that the polar alignment is always
can control the cameras to take pictures automatically via this
interface. The camera control cable included with the Sirius
Pro mount is compatible with select Canon EOS series DSLR
cameras. It has a right-angle 2.5mm stereo plug on one end
for connection to the drive panel and a straight 2.5mm plug on
the other end for connection to the camera. Cables for other
cameras can be sourced optionally or custom made.
USB Port: The USB port connects to an internal USB-to-serial
device (baud rate 115200 bps). It can be used to control the
mount directly from a host PC, or to update the motor control-
ler firmware.
ON/OFF Switch: Located on the left side of the mount head,
this switch turns power to the mount and hand controller on
and off
(Figure 6B).
Power LED: The power LED on the ON/OFF switch serves
as a power-on indicator and provides other status information:
Steady on: Power voltage is normal.
Slow flashing: Power voltage is low; continuing to operate
the mount may damage the battery (if a 12V lead-acid
battery is in use).
Fast flashing: Power voltage is extremely low; continuing
to operate the mount may damage the battery and the
motor controller in the mount.
Intermittent single flash: The PPEC training routine has
been triggered, but the controller board in the mount has
not received the worm index signal and the PE correction
recording has not started yet.
Intermittent double flash: The PPEC training routine has
been started and the controller board in the mount has
received the worm index signal and started to record the
PE correction. When the intermittent double flash stops, it
means the PPEC training has finished.
Intermittent triple flash: Sidereal tracking with PEC is now
enabled.
Dec Motor Sockets: These two sockets are used to connect,
via included cable, the Dec. motor unit to the main drive hous-
ing
(Figure 21).
5.2 Pinout of the interfaces
Refer to
Figure 23 on the next page,
Note:
• The SNAP port provides two trigger signals to the stereo
plug. For a camera that only needs a shutter-release
signal, either trigger signal will work. For a camera that
requires an extra “focus” signal, both signals should be
connected properly.
• The camera control cable included with the Sirius Pro
AZ/EQ-G mount is compatible with select Canon EOS
series DSLR cameras. Cables for other cameras are
optional and can be purchased separately from a dealer.
5.3 attaching the synscan Goto Hand controller
The coil cable for the SynScan hand controller has RJ-45
connectors on each end. Plug one connector into the Hand
Control port of the drive panel and the other connector into the
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