Modbus Parameter Specifications

MODBUS ACE V1.00
_______________________________________________________________________________________
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 17 of 78
Form 1003
1.3.6.1 Read holding register addressed by serial no.
Command code: 0x43
The content of several holding registers can be read out with this command.
Holding registers are parameters for which both read access and write access exist.
Contrary to "MODBUS over Serial Line Specification & Implementation guide V1.0", the fan also responds to
a broadcast command (MODBUS address = 0).
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
 1. Holding register address MSB
 1. Holding register address LSB
 Number of addresses to be read MSB
 Number of addresses to be read LSB
The holding registers will be described later.
Response from fan:
The following 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
 Byte count (number of addresses to be read * 2)
 Data of 1st holding register MSB
 Data of 1st holding register LSB
Optional:
 Data of the following holding registers (0..n)
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
0x03: The maximum telegram length for the response (80 bytes) has been exceeded,
i.e. more than 34 holding registers or 0 holding registers were requested.
0x04: A holding register cannot be read on account of a fault in the electronics