Technical Specifications
General
VT400 Technical Manual, Rev. A5 14 Doc # UM-VT400-EN
1 Technical Specifications
1.1 General
CPU characteristics MCU 89C51RD, 64KB Flash ROM, 1KB RAM, 32KB serial EEPROM.
Communication • Serial port 1: RS232C Full duplex, 2400 baud, 7 data bits/even parity or 8
data bits/no parity.
• Serial port 2: (optional): RS485 half duplex, 2400-57600 baud, no or even
parity, 7 or 8 data bits.
Display 6 digit red LED (20mm height) display.
Annunciators Net, no motion, tare, weight range 1 and 2.
Keyboard 6-key membrane type with tactile feedback.
Approvals EU type approval 10,000 divisions, 0199.62.
Accuracy class III.
Resolution Selectable up to 99.000dd (in accordance with regulations).
Max tare effect Full scale (100%).
Auto zero track Off or 0.5dd setup, selectable.
Weight digits 4, 5 or 6.
Weight steps 1, 2, 5, 10, 20, 50, 100, 200.
Digital filter FIR automatically adjusted to conversion speed, plus post filtering (rolling
average of 1, 2, 4, 8, 16, 32 samples).
Calibration methods Dead load, span and scale parameters via keyboard commands. Calibration can
be performed either by weighing or by entering load cell mV values.
Self diagnostics Hardware and software, MCU watchdog, memory failure, I/O failure, program
check.
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