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XS
RS485
Multidrop connection
This connection is used to connect the PC to a Multidrop line, which connects the RS485 with two or
more Drives and DGF boards. The maximum length of the connection is 600 meters. It is reccomended to
connect the CV300CTI converter as close as possible to the PC and use the RS485 line to cover the remaining
distance required by the connection.
Supply the board through the connector XS1 providing a +5V (±10%) supply referred to GNDD. The
supply must be provided to the XS1.9 (+5V) and XS1.5 (GND) pins.
The interface converts the RS232 of the PC into the RS485 of the Drives. The management of the
RS485 drive, must be carried out by the PC by mean of the RTS∗ command, available on the RS232 serial line
connector. When active, the command RTS∗ enables the RS485 drive for the transmission.
The two dip-switches placed on the interface have the function to insert or disconnect the terminating
resistors of the line, when set as first and last drop of the net. As default the terminating resistors are
disconnected (switches = OFF).
The interface connects directly the command RTS∗ (7) to the signal CTS∗ (8) and the command DTR∗
(4) to the signal DSR∗ (6) of the PC.
The Multidrop configuration is carried out connecting the CV300CTI interface to the Drives or DGF
through a standard cable. The connection requires only the direct connection of pins 3, 5, 7 and 9 (4 wires) of
the two connectors XS1 (6KCV300CTI) and XS (Drive or DGF). For this it is necessary keeping the pin XS1.4
not connected to any signal (Float).
GEI-100275
Dip-switches
DRIVE
S12-13 ON / S18-19 B-C
DGFC
S21-22 ON / S23-24 ON
6KCV300CTI
PCI-485
XS1
Figure 1.1 Point to point connection
6KCV300CTI - 11/97
RS232
XS2
Dip-switches
OFF
3
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