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This 2006 design is commercially sold, but the circuit is provided here
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RS485 Converter
RS232 to RS485 Converter specification
- Data (vs RTS) controlled - does not rely on PC handshake timing
- DB25 RS232 connector compatible with PC
- TxD and RxD translated from RS232 to RS485
- 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
- Pullup/Pulldown resistors on RS485 to establish line-idle condition
- Baud rate is dipswitch selectable 1200 - 115.2k
- $128 Australian 2-49pc
- $99 Australian 50pc and up
- Manufacturing Rights to the design (including source code) available for the cost
of 50 units
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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
US SITE · AUS SITE
