DEIMOS Electronics Manual - Cradle Electronics

Schematic: schematics/VLTSERVO.sch.pdf
Page last updated: February 3, 2003

Extra info:

Bay A	Bay B	Bay C	Bay D

Click image for larger picture

Sheet 1:

Simplified Diagram

The above diagram is a representation of the overall cradle electronics for the DEIMOS instrument. Note that the background color in each of the blocks is different. The different colors represent different areas of the instrument. For example, the light blue color represents the 'C' bay and the light green background represents the 'B' bay of the cradle The left top of the diagram shows the 'private network' coming into the instrument. This network is used to communicate between the instrument computer and the instrument electronics. This 10base2 cable provides control and status that is not available to the outside world. The instrument elements that use this network are the rotation Linux PC, the two Lantronix terminal servers. The local terminal server is currently connected to the CCD controller UPS and the handheld barcode scanner that is used to identify the removable spectrograph elements - filters and slitmasks.
In the blue box, the private network connects to the Linux PC. Again, this connection allows the PC to communicate with the instrument controller. In particular, the rotation computer talks to the DS9 software to sync the DEIMOS instrument rotation to the motion of the telescope. The PC has a Galil DMC-1820 servo motor controller card installed to control the instrument rotation. J6 and J8 on the co0ntroller card are wired to two 24-channel Opto-22 relay racks. As seen above, one card is used for digital inputs and the other for digital outputs. This I/O is used to control and monitor many functions on the instrument cradle (See EL-3113 and EL-3115 for more details.)
The Galil AMP-1920 block represents not only the amplifier but also a set of connectors mounted to the amplifiers. These connections include the following: