CMS-660 SYSTEM
CIRCUIT MONITORING SYSTEM (CMS)
23
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Modbus
Trigger hold, reset min and max values
Write operation on this register [3010h]
• triggers the hold measurement of all sensors, and / or
• resets the minimal and maximal values of all sensors.
Show Sensor
Write operation on this register [3011h] allows to start or stop the fast LED blinking of one specified
sensor for diagnosis purpose.
Start / stop command is in the following bit format position:
000S 0000 0CCC CCCC
• C
Sensor ID
• S
0 = stop fast LED blinking
1 = start fast LED blinking
Data written has to specify a known sensor ID.
• When sensor is addressed correctly, common response will follow.
• When the specified sensor ID is not used in system, Modbus exception code 03h “illegal data value”
will follow.
• When “Show sensor” function is active and one sensor LED is fast blinking, then it’s possible to press
the pushbutton of another sensor. Following, the other sensor starts fast LED blinking, and its ID can
be read from the “Show sensor” register [3011h] in the format show above.
Add Sensor
Write operation on this register [3012h] with value 0000h starts physical assignment procedure:
The specified sensor will be added logically to the system, whose pushbutton will be pressed.
Its ID will be the lowest free and available ID in the system.
Allowed range for sensor ID: 0001h .. 0020h (1..32)
• When sensor is added correctly within time out (see section “Sensor physical assignment time out,
start procedure”), common response will follow.
• When time out is reached, Modbus exception code 04h “slave device failure” will follow.
• Write operation with sensor ID out of range or with sensor ID already used will lead to exception
response with Modbus exception code 03h “illegal data value”.
Remove Sensor
Write operation on this register [3013h] with the value of a known sensor ID removes the specified
sensor logically from the system.
Write operation on this register [3013h] with value 0000h starts physical assignment procedure:
The specified sensor will be removed logically from the system, whose pushbutton will be pressed.
• When sensor is removed correctly, common response will follow.
• When sensor ID is not used in system, exception response with Modbus exception code 03h “illegal
data value” will follow.
• When time out is reached, Modbus exception code 04h “slave device failure” will follow.
Value
Description
xx1x
Trigger hold measurement
xxx1
Reset min and max values
