Eltek Valere UNV-F 2.5 Manual de usuario descargar pdf (Pagina 14)

DC Controller

UPC4 Master

User Manual

Page 14/100

3.2.2.6 Function of the dip switches

The dip switches (see Figure 3.) are designed to terminate the field bus.

By switching switch 1 to

ON position the termination resistor of 120 Ω is enabled. That is necessary if

the UPC4 master is one end of the field bus. In this case the field bus is either connected to the RS485

connector or to the MSTB connector.

If both connectors are used or e.g. a Y-cable is conne

cted to the RS485 connector the UPC4 master is

between two field bus nodes. In this case the termination resistor must be switched OFF by switch 1.

In order to enforce the idle level on the bus system at the period of time when no data transmitter is

activ

e, LINE B can be switched via a resistor of 1 kΩ to ground by switch 2. LINE A can be switched via

a resistor of 1 kΩ to VCC by switch 3. Whether this functionality is used or not depends on the bus

architecture as well on what the user wants. The enforced idle level should be carried out on the bus

once only.

3.2.2.7 Connector RS232 (Modem)

In addition to the Ethernet connector the UPC4 Master can be configured via RS232. In this case a “Null

Modem Cab

le” must be used for the connection to the configuration software MMT.

Furthermore a modem can be connected to the RS232 connector (see Figure 3.).

REMARK: The modem functionality is not supported at version 2.12.

For details please see section 6.1.1 “Configuration of UPC systems…

” and section 5.4.6 “control

function modem” as well.

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Eltek Valere UNV-F 2.5 Manual de usuario Pagina 14