Transmitter WST

Download PDF

Digital weight transmitter for load cells with RS232/RS485/USB interface fully configurable (protocol, continuous transmission/master-slave, Modbus RTU, serial parameters).

Optional interfaces: Ethernet and Profibus DP by connection with external converters. Calibration procedure with sample weights or automatic theoretical. Possibility to select normal or fast weight acquisition. 3 Diagnostic status and communication lines LED lights. STAND ALONE configuration of the main parameters via DIP-SWITCH for fast setup and independently from PC. Configuration via PC application for calibration and detailed configuration of parameters.

Download installation and usage manual

Zoom Click to enlarge image

Transmitter WST

Technical Specifications

Power supply10 30 V dc
Max power consumption1 W
IsolationClass II
Installation CategoryCategory II
Operating temperature-10 / +50 C (14 / 122 F) Humidity Maximum 85% non-condensing
Storage temperature-20 / +60C (-4 / +140F)
Overall dimensions55 x 90 x 58 mm / 2.16 x 3.54 x 2.28 in (l x h x p)
MountingOn OMEGA rail
Case materialNoryl UL 94 V-0,self-extinguishing
ConnectionsRemovable screw terminals. Pitch screws terminal blocks 5.08 mm
Power supply load cells5 V dc, maximum 4 cells
Linearity< 0.01% of full scale
Temperature deviation< 0.001% of full scale/C
Internal resolution24 bit
Measuring range-3.9 mV/V - +3.9 mV/V
Weight acquisition frequency10 Hz - 80 Hz
Digital filter0.2 Hz - 50 Hz
Number of weight decimalsfrom 0 to 4 decimal digit
Zero / FS CalibrationExecutable through buttons
Serial portCOM1: Rs232c half duplex COM2: Rs422/Rs485 half duplex USB: Device, full speed. Driver per virtual COM port per PC,fornito con l'applicazione
 Max. cable length15m (Rs232c) e 1000m (Rs422 e Rs485)
 Serial protocolsASCII, continuos printable, MODBUS
 Baud rateUp to 115200 b/s, (default 9600 b/s)
Conforms to standardsCompliance to EMC norms: EN61000-6-2, EN61000-6-3, Compliance electric safety: EN 61010-1
For the complete and latest technical specifications, please refer to the technical data sheet which can be downloaded here:
Download PDF


TypeWST terminal block
Length15 m
1+ 10 30 Vdc
3RS232 Tx
4RS232 Rx
5RS485 +
6RS485 -
7- Exc. Load cell
8+ Exc. Load cell
9+ signal load cell
10- Signal load cell
11- Signal load cell
12+ signal load cell
Connections  Transmitter WST


General precautions to be followed in the installation and assembly of load cells:

  • Follow the direction of application of force on the load cell
  • Do not exceed the limits of the temperature as indicated in the data sheet
  • Do not remove labels from the load cell
  • Adequately protect the cables with sleeves or channels
  • Carry out on each load cell a ground connection with suitable cable, shunt on mounting accessories
  • Do not carry out any welding on the mechanical structure after mounting the load cell
  • Avoid or reduce to a minimum level any mechanical constraints between the rigid structure and the weighing structure to avoid error in weighing and return to zero
  • In case of vibration or dynamic loads product the load cells with puffers / shock absorbers
  • Protect load cell from any dust accumulation with any appropriate means