Return to Question

I am currently trying to communicate with a modbus slave through a RS485/Ethernet converter. The slave device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the slave's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the master's queries instead of proper answers from the slave. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem:

• use a converter: either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only possibilities I've got? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

Here's a sketch for more details:

I am currently trying to communicate with a modbus server through a RS485/Ethernet converter. The server device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the server's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the client's queries instead of proper answers from the server. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem:

• use a converter: either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only possibilities I've got? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

Here's a sketch for more details:

I am currently trying to communicate with a modbus slave through a RS485/Ethernet converter. The slave device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the slave's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the master's queries instead of proper answers from the slave. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem  :

• use a converter  : either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only posibilities I've got  ? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

EDIT

As requested here's a sketch for more details  

I am currently trying to communicate with a modbus slave through a RS485/Ethernet converter. The slave device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the slave's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the master's queries instead of proper answers from the slave. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem:

• use a converter: either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only possibilities I've got? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

Here's a sketch for more details:

I am currently trying to communicate with a modbus slave through a RS485/Ethernet converter. The slave device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the slave's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the master's queries instead of proper answers from the slave. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem :

• use a converter : either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only posibilities I've got ? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

I am currently trying to communicate with a modbus slave through a RS485/Ethernet converter. The slave device is RS485 2 wire, and the converter is RS485 4 wire. As of now, I wired both Tx+ and Rx+ to the slave's Data+ pin and the same for its data- pin. However, when communicating I only get echoes of the master's queries instead of proper answers from the slave. According to this forum the converter I use might not shut down its receivers when transmitting, thus the echoes I get.

After looking around I found two possible ways to fix the problem :

• use a converter : either buy it or make it, although I haven't found any projects about this online so maybe making it isn't worth it

• use something similar to this isolator for I2C, which prevent signals from coming back to their origin

Are those the only posibilities I've got ? I feel like buying a converter will be the final solution but I also wanted to know about the ways to go around this problem.

EDIT

As requested here's a sketch for more details