Honeywell UDC2500 ユーザーズマニュアル

The following is an example of a request to read the Gain 1 value using Function code 
20. 

Request Message (Read (Gain 1) = ID Tag 001) 

 

02 14 07 06 00 03 00 01 00 02 (CRC16) 

Where: 
 02 = 

 

Address 

 

14 

=  Function Code 20 (14 hex) 

 

07 

=   Byte Count 

 

06 

=   Reference Type 

 

00,03 

=   File Number (Access Data Value) 

 

00,01      =   Register Address (Standard Access  Gain 1 - Tag ID #1)  

 

00 02 

=   Register Count (Floating Point Data) 

 (CRC16) 

This is the response to the above request. 

Response Message  

 

02 14 06 05 06 3F C0 00 00 (CRC16) 

Where: 
 02   

= 

Address 

 

14 

 

= Function Code 20 (14 Hex) 

 

06 

 

= Byte Count 

 

05 

 

= Sub Message Length 

 

06 

 

= Reference Type (IEEE Floating Point) 

 

3F C0 00 00  = 1.50 (Value of Proportional Band) 

 (CRC16)