Black Box IC476A-F-R2 - Manual (Page 10)

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3.1 Setting the DTE/DCE Switch
For your convenience, the IC476A-X-R2 Converter has an externally
accessible DTE/DCE switch (see the diagram on the previous page). To
access the DTE/DCE switch on the IC477A-X-R2 and IC478A-X-R2,
remove the plastic shells as illustrated on the next page.
If the device connected to the Converter is a modem or multiplexor (or is
wired like one), set the switch to “DTE.” The setting causes the Converter to
behave like Data Terminal Equipment and transmit data on pin 2.
If the device connected to the Converter is a PC, terminal, or host
computer (or is wired like one), set the switch to “DCE.” This setting causes
the Converter to behave like Data Communications Equipment and
transmit data on pin 3.
ON
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CHAPTER 3: Configuration
DIP Switch S1