sorry i haven't wrote good. . I haven't set VT high but i've read it with a digital multimeter and it not becomes high.
The communication is not successful, have you set the “TE” of transmitter to HIGH before you read the “VT” of receiver with a digital multimeter?
You need to set the “TE” of transmitter to high to enable transmitting.
You say (Then set "TE" to low first) i have to set it to ground ?
Yes if your low logic voltage is 0V.
'm using only d3 , have i to change also the others pins? or i can use only one?
You can set D3 to high and ignore other pins when you needn’t them.
When you reset the D3, you should set the “TE” of the transmitter to LOW first, after everything is ready, set the “TE” to high to enable transmitting.
And you can use the multimeter to read the “VT” and “D3” of the receiver.