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Configuration
3–26 975-0704-01-01 Revision A
All of the RS 485 and Modbus settings for the Conext ComBox can be changed
as necessary. The default value for the Modbus TCP Port is 502 and the Server
Modbus Address is 201.
Select Listening in Modbus TCP Enabled to enable Modbus communication.
Modbus Byte Order
You can configure the Conext ComBox to change the Modbus byte and word
ordering for packed ASCII strings, and 32-bit values. There are two settings for
Modbus Byte Order:
1. Least Significant byte/word first (LSB First)
2. Most Significant byte/word first (MSB First)
Select the appropriate setting for your Modbus network.
The following are examples of how the settings operate.
Packed String
Example:
When sending the text string "CONEXT" over Modbus:
1. Least Significant byte:
2. Most Significant byte:
32-bit Word
Example:
When sending the value 0x12345678 over modbus:
1. Least Significant word:
2. Most Significant word:
Note
:
When writing a character string using function code 0x10 (Write Multiple
Registers), the NUL terminator MUST be written or the string will not be stored.
When writing 32-bit modbus registers, both 16-bit registers which make up the
32-bit value must be written in order to store the data.
OETCNX
CNXOET
12345678
56781234