http://mjelectronics.com/RS-232-to-RS-485-Converter-1012-pi-182
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It can convert any standard serial RS232 port to any two-wire RS485 port and vice versa. Since it is port powered it requires no external power or flow control. The port powered RS232 to RS485 converter has a DB9 female connector on the RS232 side and either a DB9 male connector or 3-way terminal block on the RS485 side
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