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Appendix
C. I/O Connections
A 15-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.
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
1 8
9 15