CHAPTER 3: Address Selection

3. Address Selection

NOTE

Be sure to set the address selections and jumper options before installation.

Each serial port on the Four Port RS-232 Serial Interface occupies 8 con- secutive I/O locations. DIP switch SW4 sets the base address for Port 1, SW3 for Port 2, SW2 for Port 3, and SW1 for Port 4. Be careful when selecting the base address as some selections conflict with existing PC ports. The following table shows several examples that usually do not cause a conflict.

Address

 

Binary

 

 

Switch Position Setting

 

 

Hex

A9

A0

1

2

 

3

4

5

6

7

280-287

1010000XXX

OFF

ON

 

OFF

ON

ON

ON

ON

2A0-2A7

1010100XXX

OFF

ON

 

OFF

ON

OFF

ON

ON

2E8-2EF

1011101XXX

OFF

ON

 

OFF

OFF

OFF

ON

OFF

2F8-2FF

1011111XXX

OFF

ON

 

OFF

OFF

OFF

OFF

OFF

3E8-3EF

1111101XXX

OFF

OFF

 

OFF

OFF

OFF

ON

OFF

300-307

1100000XXX

OFF

OFF

 

ON

ON

ON

ON

ON

328-32F

1100101XXX

OFF

OFF

 

ON

ON

OFF

ON

OFF

3F8-3FF

1111111XXX

OFF

OFF

 

OFF

OFF

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

Typically COM1:=3F8h; COM2:=2F8h; COM3:=3E8h; COM4:=2E8h

The following illustration shows the correlation between the DIP-switch setting and the address bits used to determine the base address. In the figure below, the address 300 hex through 307 hex is selected (300 hex =11 0000 0XXX in binary representation, where X is a non-selectable address bit). Note that setting the switch ON (or closed) corresponds to a “0” in the address, while leaving it OFF (or open) corresponds to a “1.”

A9

A3 EN

0

1

ON

OFF

1 2 3 4 5 6 7 8

5

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Black Box RS-232, IC181C manual Address Selection, Binary

RS-232, IC181C specifications

Black Box RS-232 is a versatile device designed for serial communication using the well-established RS-232 standard. The RS-232 standard has been a cornerstone for serial communication since its introduction in the 1960s and is widely used in various applications today.

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