84 SCU200 INSITE ENERGY MANAGEMENT SYSTEM
7.2.Wireless M-Bus
7.2.1.Wireless M-bus devices readings
SCU200 allows to connect up to 16 INS-WM modules ( in case of no INS-E3 modules are connected. ). They
can be addressed using Modbus ID from range 49-63.
Each module can be configured to listen on Wireless MBus mode C1 or T1. They are fixed to operate on
868.95MHz radio frequency.
In addition, each module have selectable antenna port ( internal is default ).
Modules can securely store Wireless MBus encryption key with meter ID and manufacturer identification.
Supported security modes are mode 5 and mode 7. Also unencrypted data from meters are supported.
All necessary configuration can be performed by Modbus protocol.
• Modbus communication settings
Baudrate Data bits Stop bits Parity
115200 8 1 E
• Modbus communication settings
Address
(hex)
Address
(dec)
Number of
registers
Access Description Memory type
0x20 32 1 R/W Wireless M-Bus mode Non volatile
0x21 33 1 R/W Antenna selection Non volatile
0x22 34 1 R Number of messages Volatile
0x23 35 1 R Message length Volatile
0x24 36 1 R Message RSSI Volatile
0x25 37 4 R Meter address Volatile
0x29 41 121 R M-Bus data Volatile
0xA2 162 7 R M-Bus data ( rest ) Volatile
0x200 512 1 W SW reset Volatile
0x201 513 1 W Factory reset Volatile
• Wireless M-Bus mode [0x20]
This register is used to select WMBus operation mode. It accept ASCII values ‘C’ or ‘T’ for desired wireless
M-Bus mode. After changing mode, restart of device is required.
• Antenna selection [0x21]
This register is used to select antenna for reception of wireless data. It accepts values 0 or 1 – where 0 is
for internal onboard antenna, thus 1 selects external antenna on SMA connector. Also due to requirement
of reinitialize onboard radio, restart of device is required to take effect.
• Number of messages [0x22]
This register holds number of received wireless M-Bus frames in device queue. It is automatically
decreased after read of entire M-Bus data registers. Device can stack up to 64 frames.
• Message length [0x23]
This register indicate length of M-Bus message in bytes that is available to read from M-Bus data
registers. It is automatically updated with length of next message after read from M-Bus data registers.
• Message RSSI [0x24]
This register hold RSSI – signal strength indicator of received frame, that is available for read in M-Bus
data registers. After read from M-Bus data registers, this value is updated with RSSI of next frame in
queue. Value is presented in dBm units without sign ( positive value ), so to correctly obtain RSSI in dBm,
this value should be multiplied by -1.
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