ABB SCU200 - Page 87

87SCU200 INSITE ENERGY MANAGEMENT SYSTEM
0x75 – Check meter
Function performs checking meter of key pointed by MFIELD and MID and compare this key with KEY0-
15 provided in modbus request.
If key exist and is same as provided in request, response is sent back to master with function code
0x75.
If key not exist or is not same as provided in request, response 0xF5 is sent back to master.
Direction Bytes Comment
M → S Any Modbus Id
0x75 Function code
MFIELD
MSB
manufacture ID
MFIELD
LSB
manufacture ID
MID
MSB
meter ID
MID meter ID
MID meter ID
MID
LSB
meter ID
KEY0, KEY1, meter key
KEY2, KEY3 meter key
KEY4, KEY5 meter key
KEY6, KEY7 meter key
KEY8, KEY9 meter key
KEY10, KEY11 meter key
KEY12, KEY13 meter key
KEY14, KEY15 meter key
CRC
LSB
, CRC
MSB
CRC
S → M 0x01 Modbus Id
0x75 Function code
CRC
LSB
, CRC
MSB
CRC
In case of no meter key in storage below response will be sent:
S → M Any Modbus Id
0x76 Function code
CRC
LSB
, CRC
MSB
CRC
• Explanation
M → S Master to Slave
S → M Slave to Master
MID Meter address Meter address [0x25]
MFIELD Manufacturer ID See EN 13757-7.
• Behavior with invalid key
If provided key is invalid, frames cannot be decrypted. In this case message are enqueued in device but
only header information is visible such as meter address and RSSI. Data length will be 0 in this case.