Modbus Parameter Specifications

MODBUS ACE V1.00
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ebm-papst Mulfingen GmbH & Co. KG
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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 18 of 78
Form 1003
1.3.6.2 Read input register addressed by serial no.
Command code: 0x44
The content of several input registers can be read out with this command.
Input registers are parameters for which only read access exists.
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. input register address MSB
 1. input register address LSB
 Number of addresses to be read MSB
 Number of addresses to be read LSB
The input 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 input 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 input registers D000 ... D10F has been exceeded
0x03: The maximum telegram length for the response (80 bytes) has been exceeded,
i.e. more than 34 input registers or 0 input registers were requested.