User's Manual

EX7100 Technical Manual - Appendix A
©1999 Exicom Technologies (1996) Ltd A-3 Issue 2 – February 2001
A.5 Input/Output
A DB25 connector provides six input/output open-collector contacts for connection of
externally generated site alarms, as well as high and low priority alarm outputs for
internal system alarms.
Note: This port uses TTL signal levels. Failure to comply with these levels may cause
damage to the EX7100.
Note: All inputs and outputs are floating.
Figure A-5 I/O circuit detail.
Opt ocoupl er
Opt ocoupl er
Pin 21 Connect to 8 -15 VDC
Pin 14 Input 0
Pin 19 Input 5
I/O DB25Inside EX7100
Optocoupl er
Optocoupl er
Pin 1 Output 0
Pin 6 Output 5
Pin 9 Connect to external ground
560 ohms
560 ohms
Optocouplers Sharp PC3Q67Q
Diode (LED) Forward Voltage: Typically 1.2 V
Diode (LED) Forward Current: Typically 20mA (min 3mA)
Transistor V
CEO
max: 35 Volts
Max I
C
: 50mA driven here for max of 7mA.