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rs485 to rs232 modem

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mikemikemike

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How can i connect to rs232modem from MAX485 chipset?
The connection is MAX485 2-wire to ATEN IC485S convertor to modem. The modem do not have any response. but i have test the cable by logic probe, which response pulse when data pass.

Is there any thing missed? RTS need to be setted?

THX......
 
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