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Low Cost RS232-RS485 protocol converter and adapter.
Use 232-TTL conversion chip and differential transmit IC, the RS232-RS485 can be dropped to as lower as 10 US$.
The mainpage introduced its schematic and
http://www.daqchina.net/daqchina/circuit/daq485a.htm
shows the real adapter.
Use 232-TTL conversion chip and differential transmit IC, the RS232-RS485 can be dropped to as lower as 10 US$.
The mainpage introduced its schematic and
http://www.daqchina.net/daqchina/circuit/daq485a.htm
shows the real adapter.