WIZ1000 send data to RS232, but cannot receive nothing

Question

Hi… I configured it and tested in TCP Client / TCP server / UDP mode using Hercules. Now I have it in the Mixed mode. 1.) Serial parameters are 115200 E71 - conn to PLC. Client mode: I connect to w1000 ip address:5000 and I can send data to PLC and it received it.PLC surely answers but I don’t see this data in client window. Server mode: I started server on laptop port 5001. This is entered also to config tool. I can send data to device, but I don’t see the reply. 2.) Same serial parameters - serial terminal instead of PLC: If I connect RS232 terminal instead of PLC, same baud rate, then I see the data I sent from ethernet TCP client via w1000 to RS232. Also if I type answer to RS232 terminal, now I see those data on my TCP client window! Why don’t I see them when PLC anwers? Timing??? PLC answers very quick! For server mode: Using serial terminal instead of device I see that in server mode RS232 device must establish connection via w1000 to the external TCP server first. After connection is made, then I can send data. Problem is that my PLC doesn’t send nothing first! For client mode: I should see the data, because I established contact from PC client first. Can You help? Firmware 1.6. Any new firmware? 192.168.1.198 iz w1000 192.168.1.23 is my laptop with Hercules 663×626 71.8 KB

Zeljko Hrvoj · Answer

Solved. WiZ1000 doesn’t control handshake lines on RS232 connector. And my PLC doesn’t respond back if DTR is not asserted - positive. What I can measure is that from handshake signals only pin 7 - RTS is active on WIZ1000, and it is always negative voltage. DTR pin 4 is always 0V which means not connected. I tried WizVSP (connect serial port to remote host - client) to force signal lines and it doesn’t help even if I change the settings on Signal lines tab. My RTS is always low, and DTR is not connected - it’s 0V. I use external DC voltage to assert DTR high to PLC, so now PLC answers.