COM462RTU_D00010_04_M_XXDE / 06.2021 37
COMTRAXX® COM462RTU
6.5
Modbus control commands
Commands can be sent to BMS devices by an external application (e.g. visualisation software).
Control via Modbus can be enabled or disabled in the browser menu
„1. Settings“ > „2. Modbus“ > „4. Control“.
Command structure (example)
Example: system setup:
BMS addr. 1 COM460IP
BMS addr. 2 COM462RTU (Modbus addr. 2)
BMS addr. 4 IRDH275
Request:
Byte
Name
Example
Byte 0
Modbus address of the COM462RTU
02
Byte 1
Function code
10
Byte 2, 3
Start register
FC 00
Byte 4, 5
Number of registers
00 04
Byte 6,
Number of bytes
08
Byte 7, 8
External address:
must always be "1" for COM462RTU.
00 01
Byte 9, 10
The internal BMS address to which the
command applies.
00 04
Byte 11, 12
Channel
00 00
Byte 13, 14
Control command
00 01
Byte 15, 16
CRC16 Checksum
84 86
