I have an Unity card connect to Liebert ITA2 UPS. I want to turn on/off UPS through Modbus RTU, but everytime i do that, it take about 8-10 minutes before it process. i try with modbus poll software and always receive 0x05 error code (The error is sent by the slave device to indicate that it has received the request but needs additional time to process it). If you have any idea about this problem, pls tell me. Thank you!