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e. WARNINGS!!!
1.
Read the user’s manual before starting the device.
2.
Work on the device must be carried out by a qualified electrical engineer. Usage
of the device by an unqualified person might result in undesired damages.
3.
Do not remove any connected cables and connectors from the device while it is
working.
4.
Check the 24VDC Voltage and earth connections before starting PD-20S
transmitter.
5.
Do not give a start to PD-20S before making loadcell connections.
6.
Connect the screen (shield) terminal of the loadcell cable, connection with the
device, to earth. As the signals coming from Loadcell are at mV level, signals can be
effected by noise when cable is not properly grounded.
7.
Make the calibration, PD-20S must have been started first and loadcell wiring
already been done, after the display shifts towards plus when pressed on the scale.
8.
Before making the calibration, make sure that Loadcell Capacity Value, Factor
Value, Sensitivity Value are correctly entered.
9.
Total resistance of loadcells connected to transmitter must be no lover than 85 Ω.
For Instance: 4 pcs of 350 Ω or 8 pcs of 700ohm loadcells can be connected.
10.
In MODBUS communication, when more than one device is used, terminating
resistor of 120 Ω 1W value shall be connected to communication port of latest
installed device.
Serial Port Data Structure
Device delivers weight value through serial port (UART).
UART parameters used;
• 9600-19200-38400-57600 Baud
• 8 Data Bit,
• None Parity,
• 1 Stop Bit.
Used Frame structure is as follows:
±
STX
D4
D3
D2
D1
D0
CR
STX : Start of Text(02h)
±
: Sign
D4…D0 : Weight value
CR :Carriage Return(0Dh)
5. COMMUNICATION
