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Rotary Switch for Pull High/Low Resistor Setting
Since the RS-485 port can support multi-drop connection or daisy-chain
connection, system engineers can connect meters, RTUs, readers, or 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 7 8 9
Ohm 150K 10K 4.7K 3.3K 1K 909 822 770 500 485
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.
(19 pages)
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