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How connect two Controller by RS485?

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I have problem with RS485 in V1040 between V280.

I create test program for testing communicate between two controllers.

At first i change V280  PORT2 to RS485 terminal and V1040 PORT2 to RS485 terminal.

Second connect with RJ12   1---1


but Master not Read Slave.

Can you help me?

In attcah test program.

MODBUS slave v280 RS485.vlp

MODBUS via v1040 RS485 master.vlp

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