Siemens MD-BMS - Page 89

Appendices
Appendix B
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MD
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BMS and MD
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BMED Power Meters Modbus Absolute/Net Value Measurement Registers and
Protocol Commands
89
Building Technologies 125-202
06/06/2017
Example Request Field Name Command
(Hex)
Response Field Name Response
(Hex)
Register value to write – low order
bits
00 Register value written – low order
bits
00
CRC low order bits 8C CRC low order bits 8C
CRC high order bits 5C CRC high order bits 5C
Command: 3706000000018CSC
Response: 3706000000018CSC
The response is from the power meter at address 37. One byte was written to at the
requested register, 0000. The value written was 0000. The CRC value was 5C8C. An
echo of the original command after the contents are written is a valid response.
Error Response
If the first register in this write command is not in the valid range of registers, the power
meter returns an error message.
Report Slave ID
This command is used to read the description, current status, and other information
specific to a remote device. A normal response includes the data contents specific to
the device.
Table 28: Format for Modbus Command 11 (17 in Decimal).
Command Information Command Layout Example Command
Power meter address nn 37
Command number 11 11
Command Example
Table 29: Example for Modbus Command 11 (17 in Decimal).
Example Request Field Name Command
(Hex)
Response Field Name Response
(Hex)
Power meter address 37 Power meter address 37
Command number 11 Command number 11
CRC low or5der bits 07 Byte count
CRC high order bits 8C Slave ID
Run indicator status
Additional data