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2.1.11
Connection to the service station (PC, DCS/Process control system)
The connection to the service station or to the control system is made via a multidrop able RS 485 interface.
The baud rate of this interface can be set to 9600, 19200 or 38400 baud via the DIP switches 2 and 3 (see
section 2.1.12). The device address for the communication via RS 485 is set by the DIP switches 4 to 8 (see
section 2.1.12).
When setting the address, care should be taken to ensure that no address is assigned more
than once, since this can lead to communication errors or even communication failure.
The adjusted baud rate must comply with the service station.
2.1.12
DIP switch settings
8 DIP switches are located on the top of the device. DIP switch 1 is used by the manufacturer for testing the
device and must therefore always be set to "OFF".
DIP switch
Setting
DIP switches 2 and 3 determine the baud rate of the RS 485 interface.
DIP switch
Setting
DIP switches 4 to 8 determine the RS485 address. A value is assigned to each of the individual DIP
switches for this purpose. The resulting address is given by the addition of the set values.
DIP switch
Setting
Example:
To accept the values set on the DIP switches, the device must be isolated briefly from power
supply.
Condition on delivery
DIP switch
Setting
The address 0 is set on the device when delivered. Care should be taken that no address is
assigned more than once.
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
1
OFF Normal status (LED test de-activated)
ON LED test activated; all three LEDs flash one after the other
2
3
OFF OFF 9600 Baud
OFF ON 19200 Baud
ON OFF 38400 Baud
ON
ON Not permitted
4
5
6
7
ON
ON
ON
ON
ON Value 1
OFF ON
ON OFF ON address = 8 + 4 + 1 = 13
1
2
3
4
OFF OFF OFF OFF OFF OFF OFF OFF
HART Multiplexer Master KFD2-HMM-16
Meaning
Meaning
8
Meaning
Value 16
Value 8
Value 4
Value 2
5
6
7
8
Manufacturer test de-activated
Baud rate 9600 baud
RS 485 address 0
Product description
Meaning
Copyright Pepperl+Fuchs, Printed in Germany
13
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