Moxa TCF-90-M プリント

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Serial Media Converters

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The TCF-90 is a compact media converter that transmits RS-232 
signals over optical fiber. Power is derived from either the serial port 
or an external power source. The TCF-90 extends RS-232 transmission 
up to 5 km with multi-mode fiber, or up to 40 km with single-mode 
fiber. A pair of TCF-90 converters can be used to connect two RS-232 

Connecting RS-232 devices to the TCF-90 is easy. The ST-type 
optical fiber connector is designed especially for data communication 
applications that transmit data either between or within buildings. The 
TCF-90 can be used for industrial applications and for applications that 
require secure data transfer.

The RS-232 port on the TCF-90 uses a DB9 female socket to connect 
directly to the host PC, with power drawn from the TxD, RTS, and DTR 
lines.  Although the TCF-90 can obtain enough power from the three 
data/handshake lines whether the signal is high or low, we strongly 
recommend setting either the RTS or DTR signal to ON.

It’s easy enough to use a multimeter to test if the serial device 
is supplying the TCF-90 with enough power through the serial 
connection, but why bother when the TCF-90 can do the testing for 
you? Connect the TCF-90 to the device’s RS-232 port and set the SW4 
switch to Test mode. If the  port power LED indicator lights up, the 
TCF-90 is receiving enough power. If the LED does NOT light up, you 
will need to attach an external power source to the TCF-90.

In most circumstances, the TCF-90 should be able to operate without 
using an external power source. However, an external USB power cord 
or DC power supply can be used in situations where the handshake 

devices with optical fiber in full duplex mode. The optical fiber isolates 
the data signals from dangerous increases in ground potential, ground 
loops, and electrical EMI/RFI noise, and enhances data security by 
eliminating the harmful effects of RF radiation and susceptibility to 
electromagnetic radiation.

lines are not available, both the RTS/DTR signals are set to OFF, or 
the attached device’s serial interface chip provides less power than 
required.

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