RS485 Converter

This 2006 design is commercially
sold, the circuit is provided here

RS232 to RS485 Converter

RS232 to RS485 Converter specification

Data (vs RTS) controlled - does not rely on PC handshake timing
TxD and RxD translated from RS232 to RS485
DB25 RS232 connector compatible with PC
Direction of transmission controlled by Data
Handshake loop the PC connection so it works with all software
RS485 signals output on D9 male with lots of Ground pins
Indicator LED(s) to show communications traffic
Line powered - powered by RS232 handshake lines
RS485 Termination resistor not included
Baud rate is dipswitch selectable 1200 - 115.2k
Pullup/Pulldown resistors on RS485 to establish line-idle condition
$256 Australian 2-49pc
$99 Australian 50pc and up
Manufacturing Rights to the design (including source code) available for the cost of 50 units

Our new model of RS485 converter overcomes the RTS controlled problem experienced by our free design. However, to do that requires a microprocessor, so there is a greater complexity to the design. We sell this unit, although currently we are limiting our sales to customers who can pay by bank transfer - which in reality is local Australian companies. This design has been relatively trouble free, and if you require quantities we can adapt the connector pinout to suit your application - however then the device will no longer fit the simple little D25 case in which you see it pictured.

The RS232 to RS485 converter

The RS485 converter circuit diagram

RS485 Converter Designed 2006
RS232 to RS485 converter
To enquire further, please call or email
Unit price includes support $256 +ship/GST