GE Industrial Solutions 6KCV300CTI - Manual (Page 6)

GEI-100275
6KCV300CTI - 11/97 5
2 Power required - Cable length – Maximum number of Drops
2.1 +5 VDC Power required
CTI converter 20mA max
Drive (RS485) 60mA max
DGF Card 60mA max
2.2 Cable length
The maximum cable length of the RS485 serial protocol allows is equal to 600 meters.
Using the CV300CTI Interface, no length of the connection cable is determined about the RS232 side
(PC side), and it is required to set the Interface directly to the PC serial output.
2.3 Maximum number of Drops
Each 6KCV300CTI can supply, in Multidrop configuration, a maximum number of 32 devices
Drives/Dgfc.
A properly sized 5V external power supply is required. A rule of thumb would be 2.5 ADC 5 V power
supply for 32 devices.
3 General information
The connection of the command DTR* to the signal DSR* is direct, without electrical interface. The
status of the signal DSR* can be used to verify the PCI-485 Interface connection to the PC.
The connection of the command RTS* to the signal CTS* is performed by mean of an electical interface
RS232. The status of the signal CTS can be used ti verify the connection and the supply of the PCI-485
interface.
4 Blocks diagram
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Figure 4.1: Blocks diagram