sn75176 connection
Hello dolar,
you do not need to connect this kind of driver to your PIC microcontroller.
If you read carefully the attached datasheet at page 7, you will find out the right connection diagram.
The communication type is a TTL half-duplex one and not an RS485 one. This means that in the same line, which consists of two wires(gnd and data wire), you can receive and send data as well. The voltage level is 0-5V. So use the 74hc126 buffer and an inverter 74HC04 as the schematic shows. In this way when the direction pin of your microcontroller is high you can send data. If it is low, you can receive.
And also connect TXD and RXD to micorocontroller's TX and RX.
If you follow these rules and construct correct data packages according to the protocol described later you will be able to properly fuction this device...
If this hardware