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3.2 CONNECTION TO THE EIA-574 (RS-232) INTERFACE
The Model 222N9 is configured as a DCE, and is wired according
to the EIA-574 standard.
Due to its small size, the Model 222N9 is able to plug directly into
the serial port of your EIA-574 DTE device (PC, laptop, etc.). If you
must use a cable to connect the Model 222N9 to the DTE device, make
sure that it is a straight through cable of the shortest possible
length—we recommend 6 ft or less.
3.3 OPERATING THE MODEL 222N9
Once the Model 222N9 is properly installed, it should operate
transparently—as if it were a standard cable connection. Operating
power is derived from the EIA-574 data and control signals; there is no
"ON/OFF" switch. All data from the EIA-574 interface, including
X-ON/X-OFF flow control information, is passed straight through. Any
hardware flow control signals are looped back at the interface and are
not passed between the short hauls.
EIA-574 Standard
DB-9
3---------------------TD
2---------------------RD
7---------------------RTS
8---------------------CTS
1---------------------CD
4---------------------DTR
6---------------------DSR
5---------------------SG/FG
9
SIGNAL
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