Sigma SQM-160 Appendix C. I/O Connections, Relay I/O Connector Rear View, Pins, Type, Description

Appendix

C.I/O Connections

A15-pin female D-sub connector is included with the instrument to connect digital I/O to the SQM-160 Relay I/O connector. The figure below shows the solder side pin assignments for the connector.

1	8
9	1 5

Relay I/O Connector Rear View

Relays are rated for 125VAC or 30VDC, 2A maximum. Inputs can be activated either by connecting to a switch and shorting to Ground, or they can be driven by a TTL compatible signal. These are not isolated inputs! The voltage level applied must be limited to between 0 and +5 volts with respect to Ground.

Pins	Type	Description
1,2	Relay	Crystal Fail Relay, contacts closed when all
		enabled sensors have failed.
3,4	Relay	Timer Setpoint, contacts closed when timer
		reaches Zero from its programmed value.
5,6	Relay	Shutter Relay, contacts closed when shutter
		is open.
7,8	Relay	Thickness Setpoint Relay, contacts close
		when thickness value reached.
9	Input	Zero Timer Input, grounding this pin will zero
		the timer.
10	Input	Zero Thickness Input, grounding this pin will
		zero the thickness reading.
11	Input	Close Shutter Input, grounding this pin will
		close the shutter.
12	Input	Open Shutter Input, grounding this pin will
		open the shutter.
13,14,15	Ground