MODBUS LITE V5.01 parameter specification

MODBUS parameters "ebm-papst series 84 / 112 / 150 / 200"
_______________________________________________________________________________________
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
·Page 9 of 70
Form 1003
1.3 Commands
1.3.1 Read holding register
Command code: 0x03
This command is used to read out the content of a number of holding registers.
Holding registers are parameters for which both read and write access are possible.
Command from master:
4 data bytes are transmitted:
 1st MSB holding register address
 1st LSB holding register address
 Number of MSB addresses to be read
 Number of LSB addresses to be read
The holding registers are described below.
Response from fan:
The following data bytes are transmitted:
 Byte count (number of addresses to be read * 2)
 Data in 1st MSB holding register
 Data in 1st LSB holding register
Optional:
 Data from the following holding registers (0 to n)
Exception codes:
In case of error, only one data byte (the exception code) will be transmitted
Exception codes:
0x02: Permissible range of the holding registers 0xD000 to 0xD3FF exceeded
0x03: Maximum telegram length for response (23 bytes) exceeded,
i.e. either more than 9 holding registers or 0 holding registers were requested.