Omron Photo Microsensors  Dimensions and wiring.

Home sensors are highly recommended on all shutter axis (camera, projectors, fader), and are advisable but not mandatory for translation axes (North/South, East/West, Zoom).

This diagram shows how to wire an IBM PC parallel port to an Omron OR508ND home sensor. The "5 VDC Supply" must be regulated, as this voltage will be directly driving the computer's parallel port, and must be TTL compatible. Note that up to five home senors can be monitored by each parallel port (on pins 10-13 and 15). You can also use the Kuper Logic Connector to accept more sensor inputs.

The Omron OR508ND or equivalent microsensors are available from DigiKey or other electronics distributors.

Description		Digikey Part#	Price (*)
	Omron EE-SX670 Photo Microsensor	OR508ND	$39.02
	4 Pin connector for the above	OR527ND (Now known as EE-1001)	$6.17

* Prices are 2024 from Digikey. Much lower prices can be found on ebay.
(In 1998 the EE-SX670 was $8.97, and EE-1001 was $1.90)

— Omron Home Sensor Options —

EE-1001

Purchasing Comments

• If you need 8, buy 10. It's good to have a few extra, incase you trash a couple during mounting.

• Buy a few extra of the EE-1001 solder connectors, in case you melt a few.

• Don't forget to buy pullup resistors if your system needs them; 1K ~ 2K are recommended. (Pullup resistors AREN'T needed if you're using the OPCS PIO-100 interface boards)

Wiring Comments

• Use the 'parallel.exe' program that comes with OPCS to test home sensors connected to the parallel port, or use the '8255.exe' program for sensors connected to a generic 8255 programmable I/O card, or use the 'kuper.exe' program for sensors connected to the Kuper Logic Connector.

  These programs have a little 'logic osciliscope' and sound cues that lets you easily debug problems with home sensor inputs to the computer.

  Note: under OPCS, the RTMC-16 logic connector should only be used for inputs; do *not* use it for outputs, since the port is write only, which confuses programs that expect to be able to read the bits as well. With the RTMC-48, do not use the kuper logic connector at all, neither for inputs or outputs; it does not support port read/writes in a single I/O operation.

• Be sure to use shielded cable, and ground the shield at a common grounding point at the chassis. Make sure your chassis is properly grounded.

• Make sure your 5 volt supply is properly isolated from inductive devices, to prevent back-currents to the computer.

• When running the home sensors wires, do NOT bundle them with the motor drive wires, to avoid noise/crosstalk problems.

• Use an oscilliscope to monitor the home sensor signals at the computer while motors are running to check for potential crosstalk.

OR508ND / EE-SX670. Dimensions are in millimeters.
4 pin connector (OR527ND / EE-1001) not shown.

For more info on home sensors, see this home sensor thread in the OPCS forum.