RS485 Modbus to USB Adapter


Modbus to USB adapter


Connect and monitor a smart meter to a computer using this Modbus to USB adapter.

No additional power supply needed, compatible with USB, RS-422 and RS-485 standards. It can convert the single-terminal USB signals into balanced differential RS-422 or RS-485 signals, provid ing surge protect ion power for each line. The surge voltage caused by different reasons on lines and the extremely tiny interelectrode capacitance guarantee high speed transmission of RS-422/RS-48 interface. RS-422 and RS-485 terminal connect by RJ-45 and DB9 male connector. The internal converter has the function of zero delay automatic sending and receiving conversion and the independent I/O circuit controls data flow direction; it doesn’t need shake hands signals (e.g. RTS and DTR, etc. ) and jumper settings to realize full duplex (RS-422) and half-duplex (RS-485) modes conversion and plug and play. It ensures applicable to all current communication software and interface hardware. For point to multi-point, each converter can allow connecting 32 RS-422 or RS-485 interface equipment.

1. Standard: conform to USBV1.1, 1.0, 2.0 standard, EIA RS-485 and RS-422 standard 2. USB signals: VCC, DATA+, DATA-, GND, FG 3. RS-485 signals: T/R+, T/R-, GND 4. RS-422 signals: T/R+, T/R-, RXD+, RXD-, GND 5. Working mode: asynchronous working, point to point or multi-point, 2 wires half duplex, 4 wires full duplex 6. Direction control: apply data flow automatic control technology, automatically identify and control data transmission direction 7. Baud rate: 300-921.6Kbps, automatically detect serial port signal rate 8. Load capacity: support point to multi-point, each converter can allow connecting 32 RS-422 or RS-485 interface equipment 9. Transmission distance: 1200 meters at RS-485/422 terminal (at 9600bps), the USB port shall not surpass 5 meters 10. Interface protection: surge protection, 15KV electrostatic protection 11. Interface form: Class A interface male connector for USB terminal, DB9 male connector for connection

Features & details

  • Point to point/four-wire full duplex /Point to point/two-wire half duplex
  • Point to multi-point/ four-wire full duplex / Point to multi-point/two-wire half duplex
  • Transmission media: twisted-pair or shielded wire. / Overall dimension: 1555mmx36mmx16mm
  • Signal indication: 2 signal indicator lights: Transmit Data (TXD) and Receive Data (RXD)
  • Transmission distance: 0-1200 meters./Support Win/98/Win2000/WinXP/Vista/Win7/Linux, etc

Product information