• Interface requirements for M6 electronics located on the fork at a distance <1.5m from M6
• Electrical power: 230V UPS, wire cross section 0.75mm2
• Cooling: one inlet outlet are reserved at the manifold distributor for M6 cabinet Thread type: BSP cylindrical 3/8".
• Electrical signals: Terminal Block Y33
• Optical signals: 2 ST Connectors
• Housing of the M6 control electronics: Rittal cabinet 9U height mounted on the fork see Detector and M6 drives
  

E S O O n l y	Control of the High Frequency M6 tilt motions, required for field stabilization and chopping. For Adaptive Optics, a Deformable Mirror controlled by an appropriate electronics will replace M6. The control is deployed on the Sensor LCU. This sub-system belongs to the ESO delivery. The device is connected to the Terminal Block Y33. M6 drives interfaces: The connection layout and pin assignment of Y33 and ST1&ST2 is given in Annex 1 VLT-DWG-ESO-15154-1787
	Item	From	To	Signal	Description
	M6 TIP-TILT CONTROL:
	1	LCU	M6	Tip tilt angles a &b	16-bits command via optic fibre
	2	LCU	M6	Data Strobe +	COMACK Digital Output
	3	LCU	M6	Data Strobe Common	Common
	4	M6	LCU	X On-Target +	XTARONI Input. Active high. Monitor Target-On on X channel Digital Input
	5	M6	LCU	X On-Target Common	Common
	6	M6	LCU	Y On-Target +	YTARONI Input. Active high. Monitor Target-On on Y channelDigital Input
	7	M6	LCU	Y On-Target Common	Common
	8
	M6 TIP-TILT MONITOR:
	20	ATS	LCU	X-overflow +	XOVERFI* Input. Active low. Overflow error indication on X channel Digital Input
	21	ATS	LCU	X- overflow Common	Common
	22	ATS	LCU	Y- overflow +	YOVERFI* Input. Active low. Overflow error indication on Y channel Digital Input
	23	ATS	LCU	Y- overflow Common	Common
	24			Power Monitor	POWMONI Input Active high, Power monitor (M6 and Interface board)
	25			Shield

E S O O n l y	Note: This device is controlled via the STRAP system. We need the following commands for centering and tilting M6. They are defined in the STRAP interfaces [RD 07]. M6 Software Interface:
	Item	From	To	Signal	Description	Pin
	CENTERING:
	1	LCU	ATS	Center M6	Set M6 to Center Position M6	Software Command to STRAP
	TILTING:
	2	LCU	ATS	Set M6 absolute (a,b) tilt angles	Sets absolute M6 tilt angles (a,b) in radians	Software Command to STRAP
	3	LCU	ATS	Set M6 relative (a,b) tilt angles	Sets relative M6 tilt angles (a,b) in radians
	4	ATS	LCU	Get M6 absolute (a,b) tilt angles	Gets absolute M6 tilt angles (a,b) in radians

Last modified: Mon Dec 18 13:55:49 MET 2000