More on the photodiode/shutter

Further details on the photodiode/shutter are shown in Tables A.2 and A.1, and Figs. A.2 and A.3.

Table A.1: Shutter control box input/output signals

Signal	In/out	Value	Use
MON	output	adjust	monitoring high/low output voltage
OPEN	output	5 V	shutter open
		0 V	shutter not open
SHUT	output	5 V	shutter closed
		0 V	shutter not closed
L/R	output	5 V	local mode
		0 V	remote mode
CPU	input	5 V	close shutter
		0 V	open shutter

Table A.2: Shutter control cable pin assignments

Pin no.	Wire color	Assignment
1	YLW	Solenoid +
2	GRN	-
3	RED, ORG	+
5	BRN, BLU	-
6	ORG/WHT	NOT_SHUT (microswitch 1)
7	BLK	Shield
10	YLW/WHT	SHUT (microswitch 1)
11	BRN/WHT	NOT_OPEN (microswitch 2)
12	RED/WHT	OPEN (microswitch 2)
13	BLK	GND (microswitch 1)
14	BLK/WHT	GND (microswitch 2)

Figure A.2: Typical speed of movement of the solenoid. f=1 corresponds to an applied voltage of 13.2 V, f=1/2 to 18.5V and f=1/4 to 26 V. Currently the high voltage is set to 28 V and the stroke 0.12 inches.
Restrictions: Do not open and close the shutter more than 12 times per second for an extended period of time.

Figure A.3: Logic circuit of the shutter control boxes.