USB interface convertor offers unique IDs
A Saelig Company product story
Edited by the Electronicstalk editorial team Sep 17, 2007
Multiple USB-485-K convertors can be used on the same PC as they will each appear under a new COM port number.
The USB-485-K is a versatile USB-to-RS422/RS485 isolated interface convertor intended to provide an RS422/485 port on a PC only has a USB port available.
Software drivers provided create a virtual COM port for standard Windows application programs.
Isolation between the USB interface and the RS422/485 (DB9F) interface is 1500V AC RMS.
This makes it suitable for breaking ground loops or for protecting equipment.
Each USB-485-K contains a USB device ID, since it is based on FTDI ICs.
This ensures that whichever USB port it is plugged into, it always appears under the same COM port number.
This allows customers to use multiple USB-485-K convertors (even into the same USB port) on the same PC as they will each appear under a new COM port number.
USB-485-K is a 1m, self-contained adapter cable that needs no switch or software configuration.
The only customisable features are whether the RS4xx drive is to be permanently enabled or whether the RS4xx receiver is to be forced to be permanently enabled for receipt of all transmitted data.
These selections are done by grounding pins 9 and 5 respectively.
The selection of baud rate and character format is done by the Windows application program.
The USB-485-K is powered entirely from the PC's USB port using an internal isolated inverter to drive the isolated RS422/485 interface.
The USB-485-K performs automatic driver enable (ADE) automatically, enabling the RS485 drive for each transmitted character, eliminating the need for application software to provide RTS control.
This can be overridden by grounding pin 9 of the DB9 connector to permanently enable the drive stage, for RS422 (or four-wire RS485 Master) applications.
All baud rates up to and including 115200 baud are supported.
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