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DMS9648O - User manual
9.1
Data logger
DMS9648O features a basic data logger function which can be enabled on
parameter 109
Data logger.
After the initial start-up following the switch-on,
the device will start to save process data on eeprom according to a selected
time basis. Sampling time must be selected on parameter 110
Datalogger time
.
Stored data may be read via Modbus protocol starting from address 6001 (see
following section of this manual). The following table provides info about the
stored data:
6001(H) 6002 (L) Data logger: firmware version
6003(H) 6004 (L) Data logger: sensor type
6005(H) 6006 (L) Data logger: decimal point
6007(H) 6008 (L) Data logger: measure unit
6009(H) 6010 (L) Data logger: sampling time in seconds
6011(H)
6012 (L)
Data logger: flag end of memory.
0
indicates that
memory is still available.
1
indicates memory is saturated
and device restarted to store data from address
6033/6034
6033(H) 6034(L)
First analogue input value stored.
6035(H) 6036(L)
Second analogue input value stored.
...
...
...
8031(H)
8032(L)
Last analogue input value stored.
Reading of value 0x80000000 (-2147483648) stands for end of stored data:
eventual data which should be read afterwards are not valid.
10
Serial communication
DMS9648O is equipped with RS485, it can receive and broadcast data via serial
communication using MODBUS-RTU protocol. The device can be configured
only as a Slave. This function enables the control of multipledevices connected
to a supervisory system. Each controller responds to a master query only if the
query contains the same address as that in the parameter parameter 126
Slave
address
.
The permitted addresses range from 1 to 254 and there must not be controllers
with the same address on the same line.