Black Box PC↔422/485 Instructions Manual page 14

Serial interface
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Table 3-1. Selecting the Address with DIP Switch S1
Switch Position
1
2
3
4
5
6
7
8
*These addresses are not supported by DOS, but can be
supported by special software. Be very careful if you select
the address 278 to 27F or 378 to 37F: These are normally
parallel-port (LPT2: and LPT1:) addresses, and if a printer
or any other device is plugged into a parallel port on the
same PC, there could be a conflict.
Serial Port Address (Hexadecimal)
238 to 23F*
2B8 to 2BF*
338 to 33F*
3B8 to 3BF*
278 to 27F*
2F8 to 2FF (COM2:)
378 to 37F*
3F8 to 3FF (COM1:)
CHAPTER 3: Installation
13

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