Moxa ICF-1150-S-SC [3/9] Ring mode
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Moxa ICF-1150-S-SC [3/9] Ring mode

Moxa ICF-1150-M-ST-IEX [3/9] Ring mode
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Rotary Switch for Setting the Pull High/Low Resistor
Since the RS-485 port can support multi-drop
connections or daisy
-chain connections, system
engineers can connect meters, RTUs, readers,
and many other devices together on the same
bus. The impedance of the data line will rise
according to the number of serial devices on the
same bus. To get the system working, the
ICF
-1150 has a setting for tuning the pull
high/low resistor. Just turn the dial to find the
best resistor value for the system without
removing the ICF
-1150 from the DIN rail. (The
default settings are 1k for both switches.)
Pull High/Low Resistor
Position
0
1
2
3
4
5
6
8
9
Ohms
150k
10k
4.7k
3.3k
1k
909
822
500
485
DIP Switch for Selectable Terminator
The termination resistor for many products of this type is set by a jumper
located inside the product’s casing. To disable or change the resistor’s
strength, the user must open the casing to reset the jumper. Moxa offers
a more user-friendly solution that allows users to set the termination
resistor with a DIP switch located outside the ICF-1150 converter’s
casing.
No Configuration Required for Baudrate Settings
The ICF-1150 works under any baudrate from 50 bps to 921.6 kbps. The
ICF-1150 simply converts the signal back and forth between serial
(RS-232, RS-422, or RS-485) and fiber. Since the ICF-1150 does not
need to interpret the signal, it does not need to know the baudrate of the
transmitting device. For this reason, the ICF-1150 does not have any DIP
switches or jumpers for setting the baudrate.
Ring Mode
To allow one half-duplex serial device to communicate with multiple
half-duplex devices connected to a fiber ring, you should configure the
ICF-1150 for “ring mode” by setting DIP switch “SW3” to the “On”
position. The Tx port of a particular ICF-1150 unit connects to the
neighboring converter’s Rx port to form the ring. Note that when one
node transmits a signal, the signal travels around the ring until it returns
back to the transmitting unit, which then blocks the signal. Users should
ensure that the total fiber ring length is less than 100 km when using
either single-mode models or multi-mode models.

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