Our RS485 / RS232 USB converter products - Hjelmslund Electronics
All products have internal fifo for smooth data transfer and are powered from the USB connector, hence no external power supply required. Fully Win-7, Vista, XP & W2K compatible and work even with a
laptop PC. Windows virtual comport driver makes them accessible as standard
com ports.
Go to the support section for driver download or for download of technical notes.
USB485-STISO2 wire half duplex version.
Customized versions can be made on request - from 25 pieces.
USB485-STISO : Isolated USB to RS485 converter
Connect your control network to the PC with an isolated RS485 converter, using it as a virtual com port.
Its isolation barrier and readiness for Modbus gives it the quality needed for
use in industrial automation.
2 wire half duplex w. Automatic Rx/Tx switching and Rx/Tx FIFO
for smooth operation - no programming of RTS to set the
direction, and no dip-switches.
Drives up to 256 nodes, 1Mbps, 2.5kV
isolation voltage.
USB485-STI4W4 wire full duplex version.
Customized version can be made on request - from 25 pieces.
USB485-STI4W : Isolated USB RS485/422 converter
Our 4 wire full duplex model of USB to RS485 converters.
The receiver is always enabled, but the transmitter is only
enabled during data transmission, thus making it possible to use
it even as a slave device.
The superiour hardware performance makes it the perfect choice for
use in industrial automation and communication.
Drives up to 256 nodes, 1Mbps, 2.5kV
isolation voltage.
Our RS232 USB converter supports up to 1Mbps speed and includes 256 bytes Tx FIFO and 128 bytes Rx FIFO for smoother datatransmission.
The USB side is electrically isolated from the RS232 interface, hence protecting the PC against electrical fails from your RS232 system. The isolation protects for fails up to 2500Volt.
USB232-STISOIsolated RS232 version.
Customized version can be made on request.
USB485-GISO : Panel mount RS485 converter
Superiour system separation with panel mounted electrically isolated USB to RS485 converter
Mount it as any other port in your enclosure, with the USB
connection outside and the RS485 cable inside. By placing your
isolation barrier in the cabinet side, you avoid getting USB cables
into your industrial installation, as well as avoiding having industrial
communication near your pc, hence maintaining the best possible system separation.
The perfect match for your PLC installations and industrial communication networks.
The USB to RS485 converter are available in both isolated and non-isolated models.
We’ve been in business since 1990, where we began making projects for industrial automation according to customers specifications, often interfacing PC and
Omron PLC to external RS422 and RS485 devices such as Advantech Adam modules, mainly to the Chemical Physics industry and research labs.
Our present
Time changes, and so do we. We've turned to smaller and more complex technologies, using ARM microprocessors (Primarily ARM7), USB, Bluetooth in
customer specified projects, and we've just started developing own projects,
selling to end-users.
Our future
2011 is dedicated to launch our own products, making them available for sale through our website.
Our main products will be the USB485 family of Modbus RTU compatible USB to RS485 converters, that is unique because of its isolation barrier and compactness, usually to be found in much larger converters. Panel mount RS 485 to usb types as well as RS232 type sticks will be our cornerstone.
Furthermore we've scheduled a 4 wire RS485 and RS422 version, and a RS485 for
din rail mounting.
