Ducati RS 232 User Manual page 5

The figure below illustrates the rear panel of the converter:
In the upper right area of the rear panel is the switch through which the 230 Volt (+5%; -15%)
power supply passes to the converter.
To the left of the switch is the fuse compartment which houses a "fast" 0.5 A fuse with
dimensions of 5 mm x 20 mm. The fuse compartment can be opened by unscrewing the cover in a
counterclockwise direction.
In the lower left-hand corner is the terminal block with four screws relative to the RS 485 serial
port.
Terminals A and B are for connecting the two-wire pair of the Belden 9841 type shielded cable
which is then connected to the corresponding terminals of a MACH or other instrument equipped
with an RS 485 serial port.
Terminal G is connected to the mass of the converter by means of a 100 ohm resistor and can be
used as a voltage equalizer to be connected to the corresponding terminals of the analyzers or
instruments set on very long networks (up to 1500 meters max.). The third wire or first shield of the
Belden 9841 cable can be connected to this terminal.
Terminal S is connected to the mass of the converter. To this, and only to this, should the fourth
wire ("copper braid") or second external shield of the Belden 9841 cable be connected.
To the right of the RS 485 terminal block is the RS232 serial line connector to which the
supplied serial cable of the converter itself is connected to then go to one of the serial ports of the
Personal Computer.
DUCATI
energia s.p.a.
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