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2.7 Masterswitch
Figure 2-9 APC Masterswitch power distribution unit AP9212
In principle, the Masterswitch is a very simple device. It allows software control of eight 240V
power outlets. Currently, the Masterswitch is responsible for supplying power to the following
devices within the APT enclosure.
1. Anti-Backlash Motor
2. RA Servo
3. Dec Servo
4. Macro Station
5. CCD Camera
6. Lens Fan
7. Room Lamp
8. Infra-Red Lamp
The Masterswitch power is sourced from the UPS.
2.7.1 Masterswitch control
There are two devices build into the Masterswitch to facilitate control:
• An RS232 serial port (Control Console)
• APC Management Interface Board
The console is primarily intended for initially configuring the device. The APC Management
Interface Board provides a much richer set of functionality via a network connection. Once it is
configured with an IP address, the Management Interface Board supports several methods of
control:
• SNMP – Simple Network Management Protocol (SNMP v1)
• TELNET
• HTTP Web Based Interface
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