Datakom D-500, Руководство пользователя

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D-500 User Manual Rev_06 Firmware V-5.8
K35D05-EN - 41 -
The unit is able to become the remote display and control panel of another identical module.
The connection between two modules is done through RS-485 ports. For the best results, a 120 ohms
balanced, low capacitance cable should be used.
The data rate between modules is selectable between 2400 and 115200 bauds.
A high data rate offers better synchronization between modules, but the distance will be limited.
Typically at 115200 bauds and with adequate cable, the distance will be 200m maximum.
At 9600 bauds and adequate cable the distance can go up to 1200m.
Below settings are necessary:
PARAMETER MAIN UNIT REMOTE DISPLAY UNIT
Annunciator Mode 0 1
RS-485 Enable 1 1
RS-485 Baud Rate any same as main unit
Modbus Slave Address any same as main unit
The standard unit is also 400Hz enabled. The nominal frequency setting accepts up to 500Hz. Usual low
and high limits will apply without any special setting.
The measurement system of the unit allows frequencies up to 1000Hz to be measured precisely.
However the display is limited to 650Hz. Frequencies over 650Hz will be displayed as 650Hz.
The bandwidth of the harmonic analyzer is limited to 1800Hz. Thus in case of a 400Hz system, only the
3
rd
harmonic will be displayed.
The waveform display of a 400Hz signal will be represented with 10 points. It will not be as accurate as
50/60Hz signals.
For more details please read chapter: “Waveform Display & Harmonic Analysis”.
5.7. 400HZ OPERATION
The remote display panel should be powered up
with an isolated voltage source, like a wall adapter.
Otherwise damages due to ground potential
differences may occur.
5.6. REMOTE DISPLAY UNIT FUNCTIONALITY