Modbus Parameter Specifications

MODBUS ACE V1.00
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ebm-papst Mulfingen GmbH & Co. KG
Bachmühle 2 ·74673 Mulfingen ·Phone: [phone] ·Fax: [phone] ·www.ebmpapst.com ·[e-mail]
DocNo.: 634505DocNo: 446144DocNo.:358982DocNo.:322523DocNo.:309753DocNo.:303997DocNo.:276241DocNo.:256078DocNo.:196392 ·Template: 2 dated 10/6/2003 ·File: ext001931381.docx ·Last printed 9/30/2019 10:29:00
AM ·Page 19 of 78
Form 1003
1.3.6.3 Write single register addressed by serial no.
Command code: 0x46
The content of one holding register can be written with this command.
Contrary to "MODBUS over Serial Line Specification & Implementation guide V1.0", the fan also responds to
a broadcast command (MODBUS address = 0) provided that no broadcast identifier (0) was used in the serial
number. As two different fans cannot have the same serial number, it is impossible for several fans to respond
to one command.
Command from master:
10 data bytes are transmitted:
 Serial no. byte 1
 Serial no. byte 2
 Serial no. byte 3
 Serial no. byte 4
 Serial no. byte 5
 Serial no. byte 6
 Holding register address MSB
 Holding register address LSB
 Data to be written MSB
 Data to be written LSB
The holding registers will be described later.
Response from fan:
10 data bytes are transmitted:
 Serial no. byte 1
 Serial no. byte 2
 Serial no. byte 3
 Serial no. byte 4
 Serial no. byte 5
 Serial no. byte 6
 Holding register address MSB
 Holding register address LSB
 Data to be written MSB
 Data to be written LSB
The command from the master is repeated in the response
Exception codes:
Just one data byte (exception code) is transmitted in the event of an error
Exception codes:
0x02: The permissible range of the holding registers D000 ... D614 has been exceeded
0x04: There is no write authorization at this authorization level (password).