Impulse DIO-104.REL (3710) - Manual (Page 10)

© Sealevel Systems, Inc. - 8 - DIO-104.REL User Manual
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.
Output Pin Assignments (P1)
Port C Bit Relay P1 DB-37 Pin Port D Bit Relay P1 DB-37 Pin
2 20 18 28
0 K1
3 2
0 K9
19 10
4 21 20 29
1 K2
5 3
1 K10
21 11
6 22 22 30
2 K3
7 4
2 K11
23 12
8 23 24 31
3 K4
9 5
3 K12
25 13
10 24 26 32
4 K5
11 6
4 K13
27 14
12 25 28 33
5 K6
13 7
5 K14
29 15
14 26 30 34
6 K7
15 8
6 K15
31 16
16 27 32 35
7 K8
17 9
7 K16
33 17
34 36
35 18 Ground
36 37
+ 5 Volts 37 19
+ 12 Volts 1 1
Reading the Outputs
The relay ports return the ones complement of the value that is currently being used
to drive the relays.
Writing the Outputs:
The output ports are the only ports that can be written. The relays on a standard
DIO-104.REL are normally open. To close a relay a one must be written to the
appropriate bit.