Kramer Electronics Life Jacket 55 series DB-9 Leaflet

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DB-9 Pin Number

Connected to:

Old Model

2

Ground

Switch # 4

3

Vcc = 8V ("55N" series only)

Switch # 3

5

Switch # 1

6

Switch # 5

Ground

7

Switch # 4

8

Switch # 3

9

Switch # 2

Switch # 1

1

Switch # 5

4

Switch # 2

To operate a switch, connect it's pin (5-9) momentarily to pin 3 ("55N"
series only) or to an external 8 VDC supply, in this case, sharing common
ground is a must for proper operation (pin 2). In the "55N" series, it is not
needed to share common ground, as supply is internal.