MODBUS LITE V5.01 parameter specification

MODBUS parameters "ebm-papst series 84 / 112 / 150 / 200"
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ebm-papst Mulfingen GmbH & Co. KG
Bachmühle 2 ·74673 Mulfingen, Germany ·Phone: [phone] ·Fax: [phone] ·www.ebmpapst.com ·[e-mail]
DocNo.: 634505DocNo.: 446144DocNo.:358982DocNo.:322523DocNo.:309753DocNo.:303997DocNo.:276241DocNo.:256078DocNo.:196392 ·Template: 2 dated 6 October 2003 ·File: ext001157859.doc ·Last printed 10/03/2015 15:13:00
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Form 1003
2.32.4 Interface emergency function:
Two default settings for the interface are stored in the fan.
The fan switches automatically to these default settings for short periods if faulty telegrams are received
(for example, as a result of different interface settings on the master and slave):
 After 10 failed attempts, the fan will automatically communicate using the setting 19,200 bit/sec, 8E1.
 After another 10 failed attempts, the fan will automatically communicate using the setting of
2,400 bit/sec, 8E1.
Exception: For configuration of 115,200 bit/sec, this step is omitted.
 After yet another 10 failed attempts, the fan switches back to the settings for "Transmission speed" and
"Parity configuration" stored in the holding registers to prevent unwanted continuous activations of the
interface emergency function.
 For additional failed attempts, the interface is no longer switched over automatically, i.e. the interface
emergency function can be activated only by switching the device off and on again or carrying out a
software reset.
The interface emergency function can only be activated when no valid telegram has been detected from the
fan. To make sure that the interface emergency function is enabled, the operating voltage of the unit should
first be switched off and back on again.
Application:
If the interface settings of the fan are unknown, they can be identified with the interface emergency function.
Recommended procedure:
 Switch fan on
 Set interface on master to standard values 19,200 bit/sec, 8E1
 Read interface setting: XX 03 D1 49 00 02 CS CS
 After 10 failed attempts, the fan will automatically communicate using the standard setting of
19,200 bit/sec, 8E1. In other words, the command given above has to be transmitted 11 times until the
fan transmits a response.
 The fan's interface settings can be determined from the response it transmits.
 The interface settings of the master and slave can now be synchronised.
Note:
The fan should not be run continuously in the interface emergency function as the values defined in the
parameters "Transmission rate" and "Parity configuration" are activated again after every "Reset" or "Adopt
parameters" command (see 2.2).
The interface settings of the master and fan must be synchronised!