Modbus TCP server
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COM465IP-COM465DP_D00216_02_M_XXEN/03.2017
6.2.6 Modbus control commands
Commands can be sent to BMS devices by an external application (e.g. data display software).
This functionality can be activated or deactivated via the web user interface.
Command structure
Writing to register:
To write use function code 0x10 "Write Multiple registers".
Start address: 0xFC00
Number: 4 registers
Always set all four registers (word 0xFC00…0xFC03) at the same time. This statement also
applies if individual registers remain unchanged.
If no other subsystem is available, enter value"1" in this register.
If a BMS channel number is not required, enter value "0" (zero) in this register.
Reading out register:
Use function code 0x04 "Read Input Registers" to read.
Possible response in "Status" register:
1008 (0x3F0) Factor division [/]
1007 (0x3EF) Baud rate
Write Read
Word 0xFC00 0xFC01 0xFC02 0xFC03 0xFC04
External
BMS bus address
Internal
BMS bus address
BMS channel command Status
You can also generate control commands in the menu "Tools" > "Modbus" >
"Modbus control commands".
0 Busy Processing command.
1 Error An error has occurred.
2 Ready Command has been processed successfully.
Value Description of parameters:
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