User`s manual

III. ADDRESSING PORTS
Setting The Address
The base address of the QS/ES-100M is set using the two DIP
switch packs. When setting the address selection switches, a switch in the
"ON" position specifies that the corresponding address line must be a
logic 0 for the port to be selected. Similarly, a switch in the "OFF" position
forces the corresponding address line to be a logic 1 for the port to be
selected.
A full sixteen bit address decode is implemented to reduce the
chance of address conflicts with other adapters in the system. The base
address of the QS/ES-100M can be set anywhere in the range of 0000 hex
to FFFF hex. Each serial port on the QS/ES-100M uses 8 consecutive I/O
locations. The ports reside in a contiguous block of I/O space in eight
byte increments, for a total of 32 contiguous bytes in the case of the
QS-100M, or 64 contiguous bytes in the case of the ES-100M. This is
shown in Figure 3.
PORT ADDRESS RANGE
Serial 1 Base Address + 0 to Base Address + 7
Serial 2 Base Address + 8 to Base Address + 15
Serial 3 Base Address + 16 to Base Address + 23
Serial 4 Base Address + 24 to Base Address + 31
Serial 5 (ES only) Base Address + 32 to Base Address + 39
Serial 6 (ES only) Base Address + 40 to Base Address + 47
Serial 7 (ES only) Base Address + 48 to Base Address + 55
Serial 8 (ES only) Base Address + 56 to Base Address + 63
Figure 3 --- Port address map
Quatech QS-100M/ES-100M User's Manual 5