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Network
abilities
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The RS232/RS485 is able to network up to 32 stations on the
same lines, at speeds up to 115,200 baud to distances of 4,000 feet (1200 meters).
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Connection capabilities
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The converter has a 9-pin DB9 connector of which only 3 lines
are used: TX, RX and Ground. Some commercial cables have "straight" data lines
whereas others are "crossed" (null modern). In order to accommodate both types,
H1 and H2 allow a straight or a cross connection to the TX and RX lines. No RTS or other
control lines are used since the link is fully duplexed.
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Lines
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The data lines are protected by 4 diodes and 2
Zeners, each
which prevent voltages over 6 Volts from reaching the drivers.
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Opt isolation
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The RS232/RS485 converter is NOT
opt isolated. Opto isolation must be provided independently in each station along the network, as is the case with our
I/O-485 process control line.
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Telephone connection
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The 6 wire link can be brought to an on board telephone jack
(RJ11) or a 6 position terminal strip.
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Voltage
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The RS232/RS485 converter can be powered from any voltage
under 32 volts and it consumes 75 mA.
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Straight and
null modem cables
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Two jumpers allow the user to reverse the RS232 Tx and Rx
cables to accommodate both straight and null modem cables.
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End-line
impedance optimization
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Interchangeable end-resistors to optimize the end-line
impedance to that of the transmission line.
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to Data Control page
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