Black Box IC470A, Руководство пользователя

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12
RS-232
↔
RS-422 INTERFACE CONVERTERS
3. Configuration (Models with RS-232
on DB25 Only)
The Async RS-232
↔
RS-422 Converters and Async
RS-232
↔
RS-422/RS-530 Converters are easy to use.
They have no internal jumpers or DIP switches to set, so
you won’t need to open the case at all unless your unit
has terminal-block connectors (see
Section 4.1.3 ).
You will have to configure units that carry RS-232 on
DB25 connectors—IC470A, IC471A, and IC472A
models—as DTE or DCE, using their external
DTE/DCE switch. (The IC473A, IC630A, and IC631A
models, which carry RS-232 on DB9, are always DCE and
have no such switch.)
Refer to Figure 3-1 on the next page: If you’ll be
plugging the Converter into a DTE such as a computer,
terminal, or serial printer, make sure the Converter’s
DTE/DCE switch is in the complementary “DCE”
setting. (“DCE” is the factory-default setting for this
switch.) If you’ll be plugging the Converter into a DCE
such as a modem or multiplexor, make sure the switch is
in the “DTE” setting.