Moxa Technologies NPort IA5150 series Manual de usuario descargar pdf (Pagina 3)

MOXA White Paper Expand Your Serial COMs with Optical Fiber

Page 3 of 6

4-wire RS-485 signals. In fact, an important feature of the

TCF-142 is that in addition to converting between serial and

fiber, it can also convert between any of the common serial

interfaces, such as between RS-232 and RS-422 as illustrated

in the above figure.

he only caveat is that when connecting to

an RS-232 device, you must remember to short the device’s

DTR signal to its DSR signal, and short the RTS signal to the

CTS signal.

Pair connection mode can be used to combine several RS-485

lines into one serial network, as illustrated in the following

figure. The disadvantage of using pair connection in this way is

that two TCF-142 units are required for each serial device.

Ring Connection Mode

TCF-142 Media

Converters

Ring Connection Mode provides a cost-effective way to connect

several serial devices together in a serial network. A closed

fiber-serial ring is created by connecting the optical transmitte

of each TCF-142 in the ring to the optical receiver of the

neighboring TCF-142. As can be surmised from the following

figure, data packets transmitted by one converter are sent to

the adjacent converter, which in turn forwards the packets to

the next converter in the ring, and so on until the signal returns

to the converter that sent the original signal.

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Moxa Technologies NPort IA5150 series Manual de usuario Pagina 3