Owner's manual
© Sealevel Systems, Inc. 
- 6 - 
ACB-MB+4.PCI User Manual 
120-Pin Connector Pin Out 
The ACB-MP+4.PCI has a 120-pin high-density connector and includes a cable 
(Item# CA339) that breaks out to four (4) DB25 male connectors. The pin outs for 
RS-232, RS-485, RS-530, RS-530A, and V.35 interfaces on the DB25 connectors 
are listed on the following pages. For customers designing their own cable, the 
mating 120-pin connector is Molex p/n 55032-1209. The pin out for the 120-pin 
connector is listed below. 
120-Pin Molex Connector 
Port 1  Port 2  Port 3 Port 4
DB25M 
Connectors
1 31 61 91  NC 
2 32 62 92  14 
3 33 63 93  2 
4 34 64 94  15 
5 35 65 95  3 
6 36 66 96  16 
7 37 67 97  4 
8 38 68 98  17 
9 39 69 99  5 
10 40 70 100  18 
11 41 71 101  6 
12 42 72 102  19 
13 43 73 103  7 
14 44 74 104  20 
15 45 75 105  8 
16 46 76 106  21 
17 47 77 107  9 
18 48 78 108  22 
19 49 79 109  10 
20 50 80 110  23 
21 51 81 111  24 
22 52 82 112  11 
23 53 83 113  12 
24 54 84 114  NC 
25 55 85 115  13 
26 56 86 116  NC 
27 57 87 117  NC 
28 58 88 118  NC 
29 59 89 119  NC 
30 60 90 120 
NC 










