Technical Description
Sealevel Systems
DIO-32.PCI
Page
5
The following table shows four common input resistors and the ranges associated with each.
Input Resistor
(Ohms)
Value Turn-On
(Volts)
Max Input Range
(Volts)
Max Current
(mA)
220
1.76
7
27
560
2.8
12
20
1K
4.1
16
15
2.2K
7.7
24
10
The maximum input voltage can be increased by increasing the input resistor accordingly. Because socketed DIP
resistor networks are utilized, they can easily be replaced with a different value. This can be done at the factory, if
necessary. The input circuits are not intended for monitoring 120 volt AC circuits. In addition to being too high a
voltage for the circuits, it is dangerous to have that high a voltage on the card.
Sensor Input Ports Pin Assignments
(DB37 Female)
Port A Bit
P1
Port B Bit
P1
0 18,37 0 10,29
1
17,36
1
9, 28
2 16,35 2 8,27
3
15,34
3
7,26
4
14,33
4
6,25
5 13,32 5 5,24
6 12,31 6 4,23
7 11,30 7 3,22
Ground 2,20,21
+ 12 Volts
1
+ 5 Volts
19
Output Ports (Reed Relay)
Reed relays provide very high quality, long life, low current (10 Watt maximum), dry contact switch closures. Reed
relays are not suited for high current applications, and can be destroyed by inductive load switching, where a spark
occurs across the contacts internally. The relays are normally open, and close when energized.
Relay Specifications
•
Contact Power Ratings: 10 Watts Maximum
•
Contact Voltage Maximum: 100 Volts DC or AC Maximum
•
Contact Current Maximum: .5 Amps DC or AC RMS
•
Contact Resistance, Initial: .15 Ohms
•
Rated Life:
Low Load: 200 Million Closures
Maximum Load: 100 Million Closures
•
Contact Speed:
Operate: .5 mS
Release: .5 mS
Bounce: .5 mS
•
Maximum Operating Speed: 600 Hertz
