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RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
Table 3-1. Available Address Combinations.
Switch 6 Switch 7 Switch 8 Port 1 Port 2 Port 3 Port 4
On On Off 3F8 2F8 3E8 2E8
On Off On 2F8 3E8 2E8 2E0
On Off Off 3E8 2E8 280 288
Off On On 500 508 510 518
Off On Off 580 588 590 598
Off Off On 1500 1508 1510 1518
Off Off Off 3220 3228 4220 4228
On On On Addresses set up by switches 1-5
NOTE
Each COM: port in the system should have a unique address. Typically COM 1: -
COM4: addresses are 3F8, 2F8, 3E8, and 2E8 Hex.
Refer to Chapter 5 for common address contentions.
The second mode of address selection provides the compatibility mode. In
this mode, the DIP switch sets the base address and the adapter occupies 32
consecutive I/O locations. Table 3-2 describes the location of each port and
its relationship to the other ports.
NOTE
For switches 1-5 to become active, switches 6, 7, and 8 must be set in the “On” or
“Up” position.