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Base 8 vs. Base 16 Port Number Systems
With the advent of the TBX-Tribus card and the ever evolving technology to a 16-channel port system, Base 8 and Base 16
port number systems were created.
Base 8 Port Number System
The Base 8 Port Number System splits 16 ports between a top and bottom group. The bottom group starts with 1 through
136; the top group consists of ports 137 through 272 (see Figure 37).
EXAMPLE: This means that if you have an AIO-16 in slot 1, ports 1–8 and 137–144 will be used by the AIO-16
card. Alternatively, if you have AIO-16’s in slots 1 and 3 and an AIO-8 in slot 2, the following port
mapping applies:
Figure 3. Example for Base 8 Port Numbering
AIO-16 Ports 1– 8 and 137–144
Ports 145-161 are not used when an AIO-8 card is in the slot
AIO-6 Ports 17–33 and 162–178
AIO–8 Ports 9–16
FIGURE 37. Base 8 Port Numbering System Example