Configuration 
Modbus Communications Set Up Group 
Release M    DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual  75 
April 2017     
3.16  Modbus Communications Set Up Group 
Introduction 
This data deals with the Communications option that is available with your recorder. This option allows the 
recorder to be connected to a host computer via the Modbus protocol. 
If your recorder does not have this option the prompts will not appear. 
 
Refer to Documents 51-52-25-66 and 51-52-25-69 for a complete description of the RS485 
Modbus Communications Option. 
 
Function prompts 
Table 3-14 lists all the function prompts in the Modbus Communications Set Up group. 
Table 3-14 Modbus communications group function prompts 
 
Function Prompt 
Lower Display 
Selections or Range of Setting 
Upper Display 
Communications Station 
Address 
300 
600 
1200 
2400 
4800 
9600 
19200 
38400 
Transmit Delay 
(in milliseconds) 
NONE 
10MSEC 
20MSEC 
30MSEC 
40MSEC 
50MSEC