Owner manual
© Sealevel Systems, Inc.  - 12 - 
REL-32 User Manual
DB-78 Female Pin Assignment 
This table shows the pin assignments via the card edge connector. 
Port 1 
Port 2 
Relay A Side  Relay B Side 
Relay A Side  Relay B Side 
Relay Port 1 - 
A 
Pin Port 1 - 
B 
Pin Relay Port 2 - 
A 
Pin Port 2 - 
B 
Pin
K1 1 2 1 20 K9 1 10 1 28 
K2  2  3  2 21 K10  2 11 2 29 
K3  3  4  3 22 K11  3 12 3 30 
K4  4  5  4 23 K12  4 13 4 31 
K5  5  6  5 24 K13  5 14 5 32 
K6  6  7  6 25 K14  6 15 6 33 
K7  7  8  7 26 K15  7 16 7 34 
K8  8  9  8 27 K16  8 17 8 35 
Port 3 
Port 4 
Relay A Side  Relay B Side 
Relay A Side  Relay B Side 
Relay Port 3 - 
A 
Pin Port 3 - 
B 
Pin Relay Port 4 - 
A 
Pin Port 4 - 
B 
Pin
K17 1 39 1 57 K25 1 47 1 65 
K18 2 40 2 58 K26 2 48 2 66 
K19 3 41 3 59 K27 3 49 3 67 
K20 4 42 4 60 K28 4 50 4 68 
K21 5 43 5 61 K29 5 51 5 69 
K22 6 44 6 62 K30 6 52 6 70 
K23 7 45 7 63 K31 7 53 7 71 
K24 8 46 8 64 K32 8 54 8 72 
Power and Ground Pin Assignments 
Via DB-78 Female card edge connector. 
Ground  18, 36, 37, 55, 73, 74 
+ 5 Volts  19, 56 
+ 12 Volts  1, 38 










