Comtrol Rocket Port Multiport Serial Cards 550 - Manual (Page 12)

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Also, note that the assigned special device names are fixed as shown in the above tables.
So, the first RocketPort will start at /dev/ttyA00, the second at /dev/ttyA16 and so on,
regardless of whether the RocketPorts are 4, 8 or 16 port examples.
For example, if installing, say, two 8 port RocketPorts then the first card will use device
names /dev/ttyA00 to /dev/ttyA07 and the second board will use /dev/ttyA16 to
/dev/ttyA23.
Of course two 16 port controllers will have sixteen contiguous device names from
/dev/ttyA00.