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DM8127: RS485 read test doesn't work - write test does...

DM8127 RDK v3.50: RS485 read test doesn't work - write test does...

Read test fails / write test works regardless of

system("echo 0 > /sys/class/gpio/gpio33/value"); - or -

system("echo 1 > /sys/class/gpio/gpio33/value");

Perhaps TX enable is attached to a GPIO other than 33?