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CMS-660 SYSTEM
CIRCUIT MONITORING SYSTEM (CMS)
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Modbus
Change Sensor ID
Write operation on this register [3014h] allows to change a sensor ID.
Bit 8 to 15 contains the “from ID”, Bit 0 to 7 the “to ID”.
• If “from ID” contains 00h, physical assignment procedure for the “from ID” starts.
The ID of that sensor will be changed, whose pushbutton will be pressed.
• If “from ID” contains a known sensor ID, the ID of that sensor will be changed.
The “to ID” has to be a free and available sensor ID in the range 01h .. 20h (1..32).
• When sensor ID is changed correctly – in case of physical assignment procedure within time out
(see section “Sensor physical assignment time out, start procedure”) –, common response will follow.
• In case of physical assignment procedure the resulting “from ID” will replace the request data “00h”.
• When time out is reached Modbus exception code 04h “slave device failure” will follow.
• Write operation with “from ID” or “to ID” out of range, with unknown “from ID” or with “to ID” already
used will lead to exception response with Modbus exception code 03h “illegal data value”.
Serial number of control unit
These registers [3100h to 3107h] contain system information about the control unit.
HW and SW version of the control unit are readable for diagnosis purpose.
This information can be read
• either by function 03h “Read Holding Registers” at specified register addresses
• or by function 11h “Report Slave ID” without additional request data.
Control unit settings
These registers contain system settings of control unit.
Addr
(hex)
Words
Data
Range
Default values when delivered.
Note: it is possible to rewrite them
3108
1
Modbus ID
1 .. 247
1
3109
1
Modbus Mode
0: RTU
0
310A
1
Baudrate / 10
240, 480, 960, 1920, 3840, 5760, 11520 1920
310B
1
Parity
0: None, 1: Even, 2: Odd
1
310E
1
Sensors LED
time out [sec]
30, 60, 90, 120, 180, 240, 300, 600, 900,
FFFFh*
30
*FFFFh means “always on”.
