WIZ550S2E not responding to "+++"

Question

Following on from my 12th May post about the loss of data on a corporate network. We are still trying to get this application working. What we have seen is that the WIZ550S2E module does not respond to the “+++” trigger to get into command mode if there is no Internet connection on the LAN network. the module has 1.4.0 firmware It also does not respond to +++ if the Ethernet cable is not plugged into the module. this is less of an issue. We have a data mode set up but are now primarily using Command Mode to send/receive data. Any suggestions? thanks John

austin · Answer

Hello @jcomfort, Entering into command mode is possible even if the ethernet cable is not connected. When entering ‘+++’, did you enter CR/LF(
) after ‘+++’? When entering ‘+++’, you do not need to enter CR/LF(
) at the end. I tested with ethernet cable removed in F/W v1.4.0. But there was no problem. Please refer to the picture below as the test result. image957×313 4.13 KB

austin · Answer

Hi @jcomfort, Even in a state set to DHCP, it is also possible to enter the command mode with ‘+++’. However, if it is set to DHCP, unlike STATIC, it goes through a DHCP loop, so it cannot enter the command mode with ‘+++’ until it exits the DHCP loop. That is, it takes quite a long time to enter the command mode in the state of being set to DHCP. Because WIZ550S2E is the S2E(Serial to Ethernet) module, it is recommended to use ethernet cable in connected state by default unless there are specific reasons to use it in unconnected state.